diff --git a/redbot/cogs/cleanup/cleanup.py b/redbot/cogs/cleanup/cleanup.py
index 8c61dc172..5b941f3c5 100644
--- a/redbot/cogs/cleanup/cleanup.py
+++ b/redbot/cogs/cleanup/cleanup.py
@@ -1,6 +1,6 @@
 import re
 from datetime import datetime, timedelta
-from typing import Union, List, Callable
+from typing import Union, List, Callable, Set
 
 import discord
 
@@ -323,15 +323,35 @@ class Cleanup(commands.Cog):
         if "" in prefixes:
             prefixes.remove("")
 
+        cc_cog = self.bot.get_cog("CustomCommands")
+        if cc_cog is not None:
+            command_names: Set[str] = await cc_cog.get_command_names(ctx.guild)
+            is_cc = lambda name: name in command_names
+        else:
+            is_cc = lambda name: False
+        alias_cog = self.bot.get_cog("Alias")
+        if alias_cog is not None:
+            alias_names: Set[str] = (
+                set((a.name for a in await alias_cog.unloaded_global_aliases()))
+                | set(a.name for a in await alias_cog.unloaded_aliases(ctx.guild))
+            )
+            is_alias = lambda name: name in alias_names
+        else:
+            is_alias = lambda name: False
+
+        bot_id = self.bot.user.id
+
         def check(m):
-            if m.author.id == self.bot.user.id:
+            if m.author.id == bot_id:
                 return True
             elif m == ctx.message:
                 return True
             p = discord.utils.find(m.content.startswith, prefixes)
             if p and len(p) > 0:
                 cmd_name = m.content[len(p) :].split(" ")[0]
-                return bool(self.bot.get_command(cmd_name))
+                return (
+                    bool(self.bot.get_command(cmd_name)) or is_alias(cmd_name) or is_cc(cmd_name)
+                )
             return False
 
         to_delete = await self.get_messages_for_deletion(
diff --git a/redbot/cogs/customcom/customcom.py b/redbot/cogs/customcom/customcom.py
index 2f17f6ef1..c9307e817 100644
--- a/redbot/cogs/customcom/customcom.py
+++ b/redbot/cogs/customcom/customcom.py
@@ -3,13 +3,14 @@ import random
 from datetime import datetime, timedelta
 from inspect import Parameter
 from collections import OrderedDict
-from typing import Mapping, Tuple, Dict
+from typing import Mapping, Tuple, Dict, Set
 
 import discord
 
 from redbot.core import Config, checks, commands
-from redbot.core.utils.chat_formatting import box, pagify, escape
 from redbot.core.i18n import Translator, cog_i18n
+from redbot.core.utils import menus
+from redbot.core.utils.chat_formatting import box, pagify, escape
 from redbot.core.utils.predicates import MessagePredicate
 
 _ = Translator("CustomCommands", __file__)
@@ -121,7 +122,7 @@ class CommandObj:
         *,
         response=None,
         cooldowns: Mapping[str, int] = None,
-        ask_for: bool = True
+        ask_for: bool = True,
     ):
         """Edit an already existing custom command"""
         ccinfo = await self.db(ctx.guild).commands.get_raw(command, default=None)
@@ -330,12 +331,16 @@ class CustomCommands(commands.Cog):
             await ctx.send(e.args[0])
 
     @customcom.command(name="list")
-    async def cc_list(self, ctx):
-        """List all available custom commands."""
+    @checks.bot_has_permissions(add_reactions=True)
+    async def cc_list(self, ctx: commands.Context):
+        """List all available custom commands.
 
-        response = await CommandObj.get_commands(self.config.guild(ctx.guild))
+        The list displays a preview of each command's response, with
+        markdown escaped and newlines replaced with spaces.
+        """
+        cc_dict = await CommandObj.get_commands(self.config.guild(ctx.guild))
 
-        if not response:
+        if not cc_dict:
             await ctx.send(
                 _(
                     "There are no custom commands in this server."
@@ -345,8 +350,7 @@ class CustomCommands(commands.Cog):
             return
 
         results = []
-
-        for command, body in response.items():
+        for command, body in sorted(cc_dict.items(), key=lambda t: t[0]):
             responses = body["response"]
             if isinstance(responses, list):
                 result = ", ".join(responses)
@@ -354,15 +358,33 @@ class CustomCommands(commands.Cog):
                 result = responses
             else:
                 continue
-            results.append("{command:<15} : {result}".format(command=command, result=result))
+            # Replace newlines with spaces
+            # Cut preview to 52 characters max
+            if len(result) > 52:
+                result = result[:49] + "..."
+            # Replace newlines with spaces
+            result = result.replace("\n", " ")
+            # Escape markdown and mass mentions
+            result = escape(result, formatting=True, mass_mentions=True)
+            results.append((f"{ctx.clean_prefix}{command}", result))
 
-        _commands = "\n".join(results)
-
-        if len(_commands) < 1500:
-            await ctx.send(box(_commands))
+        if await ctx.embed_requested():
+            content = "\n".join(map("**{0[0]}** {0[1]}".format, results))
+            pages = list(pagify(content, page_length=1024))
+            embed_pages = []
+            for idx, page in enumerate(pages, start=1):
+                embed = discord.Embed(
+                    title=_("Custom Command List"),
+                    description=page,
+                    colour=await ctx.embed_colour(),
+                )
+                embed.set_footer(text=_("Page {num}/{total}").format(num=idx, total=len(pages)))
+                embed_pages.append(embed)
+            await menus.menu(ctx, embed_pages, menus.DEFAULT_CONTROLS)
         else:
-            for page in pagify(_commands, delims=[" ", "\n"]):
-                await ctx.author.send(box(page))
+            content = "\n".join(map("{0[0]:<12} : {0[1]}".format, results))
+            pages = list(map(box, pagify(content, page_length=2000, shorten_by=10)))
+            await menus.menu(ctx, pages, menus.DEFAULT_CONTROLS)
 
     @customcom.command(name="show")
     async def cc_show(self, ctx, command_name: str):
@@ -606,3 +628,14 @@ class CustomCommands(commands.Cog):
         else:
             return raw_result
         return str(getattr(first, second, raw_result))
+
+    async def get_command_names(self, guild: discord.Guild) -> Set[str]:
+        """Get all custom command names in a guild.
+
+        Returns
+        --------
+        Set[str]
+            A set of all custom command names.
+
+        """
+        return set(await CommandObj.get_commands(self.config.guild(guild)))
diff --git a/redbot/cogs/downloader/converters.py b/redbot/cogs/downloader/converters.py
index f2a64ddc5..54f7522cd 100644
--- a/redbot/cogs/downloader/converters.py
+++ b/redbot/cogs/downloader/converters.py
@@ -1,7 +1,10 @@
 import discord
 from redbot.core import commands
+from redbot.core.i18n import Translator
 from .installable import Installable
 
+_ = Translator("Koala", __file__)
+
 
 class InstalledCog(Installable):
     @classmethod
diff --git a/redbot/cogs/downloader/downloader.py b/redbot/cogs/downloader/downloader.py
index f9df14c99..ce3df16ae 100644
--- a/redbot/cogs/downloader/downloader.py
+++ b/redbot/cogs/downloader/downloader.py
@@ -325,13 +325,12 @@ class Downloader(commands.Cog):
         You may only uninstall cogs which were previously installed
         by Downloader.
         """
-        # noinspection PyUnresolvedReferences,PyProtectedMember
         real_name = cog.name
 
         poss_installed_path = (await self.cog_install_path()) / real_name
         if poss_installed_path.exists():
+            ctx.bot.unload_extension(real_name)
             await self._delete_cog(poss_installed_path)
-            # noinspection PyTypeChecker
             await self._remove_from_installed(cog)
             await ctx.send(
                 _("Cog `{cog_name}` was successfully uninstalled.").format(cog_name=real_name)
@@ -344,7 +343,7 @@ class Downloader(commands.Cog):
                     " files manually if it is still usable."
                     " Also make sure you've unloaded the cog"
                     " with `{prefix}unload {cog_name}`."
-                ).format(cog_name=real_name)
+                ).format(prefix=ctx.prefix, cog_name=real_name)
             )
 
     @cog.command(name="update")
@@ -372,13 +371,18 @@ class Downloader(commands.Cog):
                 await self._reinstall_libraries(installed_and_updated)
                 message = _("Cog update completed successfully.")
 
-                cognames = [c.name for c in installed_and_updated]
+                cognames = {c.name for c in installed_and_updated}
                 message += _("\nUpdated: ") + humanize_list(tuple(map(inline, cognames)))
             else:
                 await ctx.send(_("All installed cogs are already up to date."))
                 return
         await ctx.send(message)
 
+        cognames &= set(ctx.bot.extensions.keys())  # only reload loaded cogs
+        if not cognames:
+            return await ctx.send(
+                _("None of the updated cogs were previously loaded. Update complete.")
+            )
         message = _("Would you like to reload the updated cogs?")
         can_react = ctx.channel.permissions_for(ctx.me).add_reactions
         if not can_react:
@@ -402,7 +406,6 @@ class Downloader(commands.Cog):
             if can_react:
                 with contextlib.suppress(discord.Forbidden):
                     await query.clear_reactions()
-
             await ctx.invoke(ctx.bot.get_cog("Core").reload, *cognames)
         else:
             if can_react:
diff --git a/redbot/cogs/economy/economy.py b/redbot/cogs/economy/economy.py
index 13edd54cf..9e32351d1 100644
--- a/redbot/cogs/economy/economy.py
+++ b/redbot/cogs/economy/economy.py
@@ -8,7 +8,7 @@ from typing import cast, Iterable
 import discord
 
 from redbot.cogs.bank import check_global_setting_guildowner, check_global_setting_admin
-from redbot.core import Config, bank, commands
+from redbot.core import Config, bank, commands, errors
 from redbot.core.i18n import Translator, cog_i18n
 from redbot.core.utils.chat_formatting import box
 from redbot.core.utils.menus import menu, DEFAULT_CONTROLS
@@ -171,7 +171,7 @@ class Economy(commands.Cog):
 
         try:
             await bank.transfer_credits(from_, to, amount)
-        except ValueError as e:
+        except (ValueError, errors.BalanceTooHigh) as e:
             return await ctx.send(str(e))
 
         await ctx.send(
@@ -195,36 +195,35 @@ class Economy(commands.Cog):
         author = ctx.author
         currency = await bank.get_currency_name(ctx.guild)
 
-        if creds.operation == "deposit":
-            await bank.deposit_credits(to, creds.sum)
-            await ctx.send(
-                _("{author} added {num} {currency} to {user}'s account.").format(
+        try:
+            if creds.operation == "deposit":
+                await bank.deposit_credits(to, creds.sum)
+                msg = _("{author} added {num} {currency} to {user}'s account.").format(
                     author=author.display_name,
                     num=creds.sum,
                     currency=currency,
                     user=to.display_name,
                 )
-            )
-        elif creds.operation == "withdraw":
-            await bank.withdraw_credits(to, creds.sum)
-            await ctx.send(
-                _("{author} removed {num} {currency} from {user}'s account.").format(
+            elif creds.operation == "withdraw":
+                await bank.withdraw_credits(to, creds.sum)
+                msg = _("{author} removed {num} {currency} from {user}'s account.").format(
                     author=author.display_name,
                     num=creds.sum,
                     currency=currency,
                     user=to.display_name,
                 )
-            )
+            else:
+                await bank.set_balance(to, creds.sum)
+                msg = _("{author} set {user}'s account balance to {num} {currency}.").format(
+                    author=author.display_name,
+                    num=creds.sum,
+                    currency=currency,
+                    user=to.display_name,
+                )
+        except (ValueError, errors.BalanceTooHigh) as e:
+            await ctx.send(str(e))
         else:
-            await bank.set_balance(to, creds.sum)
-            await ctx.send(
-                _("{author} set {user}'s account balance to {num} {currency}.").format(
-                    author=author.display_name,
-                    num=creds.sum,
-                    currency=currency,
-                    user=to.display_name,
-                )
-            )
+            await ctx.send(msg)
 
     @_bank.command()
     @check_global_setting_guildowner()
@@ -260,7 +259,18 @@ class Economy(commands.Cog):
         if await bank.is_global():  # Role payouts will not be used
             next_payday = await self.config.user(author).next_payday()
             if cur_time >= next_payday:
-                await bank.deposit_credits(author, await self.config.PAYDAY_CREDITS())
+                try:
+                    await bank.deposit_credits(author, await self.config.PAYDAY_CREDITS())
+                except errors.BalanceTooHigh as exc:
+                    await bank.set_balance(author, exc.max_balance)
+                    await ctx.send(
+                        _(
+                            "You've reached the maximum amount of {currency}! (**{balance:,}**) "
+                            "Please spend some more \N{GRIMACING FACE}\n\n"
+                            "You currently have {new_balance} {currency}."
+                        ).format(currency=credits_name, new_balance=exc.max_balance)
+                    )
+                    return
                 next_payday = cur_time + await self.config.PAYDAY_TIME()
                 await self.config.user(author).next_payday.set(next_payday)
 
@@ -297,14 +307,25 @@ class Economy(commands.Cog):
                     ).PAYDAY_CREDITS()  # Nice variable name
                     if role_credits > credit_amount:
                         credit_amount = role_credits
-                await bank.deposit_credits(author, credit_amount)
+                try:
+                    await bank.deposit_credits(author, credit_amount)
+                except errors.BalanceTooHigh as exc:
+                    await bank.set_balance(author, exc.max_balance)
+                    await ctx.send(
+                        _(
+                            "You've reached the maximum amount of {currency}! "
+                            "Please spend some more \N{GRIMACING FACE}\n\n"
+                            "You currently have {new_balance} {currency}."
+                        ).format(currency=credits_name, new_balance=exc.max_balance)
+                    )
+                    return
                 next_payday = cur_time + await self.config.guild(guild).PAYDAY_TIME()
                 await self.config.member(author).next_payday.set(next_payday)
                 pos = await bank.get_leaderboard_position(author)
                 await ctx.send(
                     _(
                         "{author.mention} Here, take some {currency}. "
-                        "Enjoy! (+{amount} {new_balance}!)\n\n"
+                        "Enjoy! (+{amount} {currency}!)\n\n"
                         "You currently have {new_balance} {currency}.\n\n"
                         "You are currently #{pos} on the global leaderboard!"
                     ).format(
@@ -444,7 +465,21 @@ class Economy(commands.Cog):
             then = await bank.get_balance(author)
             pay = payout["payout"](bid)
             now = then - bid + pay
-            await bank.set_balance(author, now)
+            try:
+                await bank.set_balance(author, now)
+            except errors.BalanceTooHigh as exc:
+                await bank.set_balance(author, exc.max_balance)
+                await channel.send(
+                    _(
+                        "You've reached the maximum amount of {currency}! "
+                        "Please spend some more \N{GRIMACING FACE}\n{old_balance} -> {new_balance}!"
+                    ).format(
+                        currency=await bank.get_currency_name(getattr(channel, "guild", None)),
+                        old_balance=then,
+                        new_balance=exc.max_balance,
+                    )
+                )
+                return
             phrase = T_(payout["phrase"])
         else:
             then = await bank.get_balance(author)
@@ -561,10 +596,10 @@ class Economy(commands.Cog):
     async def paydayamount(self, ctx: commands.Context, creds: int):
         """Set the amount earned each payday."""
         guild = ctx.guild
-        credits_name = await bank.get_currency_name(guild)
-        if creds <= 0:
+        if creds <= 0 or creds > bank.MAX_BALANCE:
             await ctx.send(_("Har har so funny."))
             return
+        credits_name = await bank.get_currency_name(guild)
         if await bank.is_global():
             await self.config.PAYDAY_CREDITS.set(creds)
         else:
@@ -579,6 +614,9 @@ class Economy(commands.Cog):
     async def rolepaydayamount(self, ctx: commands.Context, role: discord.Role, creds: int):
         """Set the amount earned each payday for a role."""
         guild = ctx.guild
+        if creds <= 0 or creds > bank.MAX_BALANCE:
+            await ctx.send(_("Har har so funny."))
+            return
         credits_name = await bank.get_currency_name(guild)
         if await bank.is_global():
             await ctx.send(_("The bank must be per-server for per-role paydays to work."))
diff --git a/redbot/cogs/mod/mod.py b/redbot/cogs/mod/mod.py
index 31f105af3..c2b0211a6 100644
--- a/redbot/cogs/mod/mod.py
+++ b/redbot/cogs/mod/mod.py
@@ -825,7 +825,7 @@ class Mod(commands.Cog):
     @admin_or_voice_permissions(mute_members=True, deafen_members=True)
     @bot_has_voice_permissions(mute_members=True, deafen_members=True)
     async def voiceunban(self, ctx: commands.Context, user: discord.Member, *, reason: str = None):
-        """Unban a the user from speaking and listening in the server's voice channels."""
+        """Unban a user from speaking and listening in the server's voice channels."""
         user_voice_state = user.voice
         if user_voice_state is None:
             await ctx.send(_("No voice state for that user!"))
@@ -893,34 +893,33 @@ class Mod(commands.Cog):
         author = ctx.author
         if user_voice_state:
             channel = user_voice_state.channel
-            if channel and channel.permissions_for(user).speak:
-                overwrites = channel.overwrites_for(user)
-                overwrites.speak = False
-                audit_reason = get_audit_reason(ctx.author, reason)
-                await channel.set_permissions(user, overwrite=overwrites, reason=audit_reason)
-                await ctx.send(
-                    _("Muted {user} in channel {channel.name}").format(user, channel=channel)
-                )
-                try:
-                    await modlog.create_case(
-                        self.bot,
-                        guild,
-                        ctx.message.created_at,
-                        "boicemute",
-                        user,
-                        author,
-                        reason,
-                        until=None,
-                        channel=channel,
+            if channel:
+                audit_reason = get_audit_reason(author, reason)
+
+                success, issue = await self.mute_user(guild, channel, author, user, audit_reason)
+
+                if success:
+                    await ctx.send(
+                        _("Muted {user} in channel {channel.name}").format(
+                            user=user, channel=channel
+                        )
                     )
-                except RuntimeError as e:
-                    await ctx.send(e)
-                return
-            elif channel.permissions_for(user).speak is False:
-                await ctx.send(
-                    _("That user is already muted in {channel}!").format(channel=channel.name)
-                )
-                return
+                    try:
+                        await modlog.create_case(
+                            self.bot,
+                            guild,
+                            ctx.message.created_at,
+                            "vmute",
+                            user,
+                            author,
+                            reason,
+                            until=None,
+                            channel=channel,
+                        )
+                    except RuntimeError as e:
+                        await ctx.send(e)
+                else:
+                    await channel.send(issue)
             else:
                 await ctx.send(_("That user is not in a voice channel right now!"))
         else:
@@ -938,13 +937,7 @@ class Mod(commands.Cog):
         author = ctx.message.author
         channel = ctx.message.channel
         guild = ctx.guild
-
-        if reason is None:
-            audit_reason = "Channel mute requested by {a} (ID {a.id})".format(a=author)
-        else:
-            audit_reason = "Channel mute requested by {a} (ID {a.id}). Reason: {r}".format(
-                a=author, r=reason
-            )
+        audit_reason = get_audit_reason(author, reason)
 
         success, issue = await self.mute_user(guild, channel, author, user, audit_reason)
 
@@ -975,26 +968,12 @@ class Mod(commands.Cog):
         """Mutes user in the server"""
         author = ctx.message.author
         guild = ctx.guild
-        if reason is None:
-            audit_reason = "server mute requested by {author} (ID {author.id})".format(
-                author=author
-            )
-        else:
-            audit_reason = (
-                "server mute requested by {author} (ID {author.id}). Reason: {reason}"
-            ).format(author=author, reason=reason)
+        audit_reason = get_audit_reason(author, reason)
 
         mute_success = []
         for channel in guild.channels:
-            if not isinstance(channel, discord.TextChannel):
-                if channel.permissions_for(user).speak:
-                    overwrites = channel.overwrites_for(user)
-                    overwrites.speak = False
-                    audit_reason = get_audit_reason(ctx.author, reason)
-                    await channel.set_permissions(user, overwrite=overwrites, reason=audit_reason)
-            else:
-                success, issue = await self.mute_user(guild, channel, author, user, audit_reason)
-                mute_success.append((success, issue))
+            success, issue = await self.mute_user(guild, channel, author, user, audit_reason)
+            mute_success.append((success, issue))
             await asyncio.sleep(0.1)
         await ctx.send(_("User has been muted in this server."))
         try:
@@ -1015,7 +994,7 @@ class Mod(commands.Cog):
     async def mute_user(
         self,
         guild: discord.Guild,
-        channel: discord.TextChannel,
+        channel: discord.abc.GuildChannel,
         author: discord.Member,
         user: discord.Member,
         reason: str,
@@ -1023,25 +1002,32 @@ class Mod(commands.Cog):
         """Mutes the specified user in the specified channel"""
         overwrites = channel.overwrites_for(user)
         permissions = channel.permissions_for(user)
-        perms_cache = await self.settings.member(user).perms_cache()
 
-        if overwrites.send_messages is False or permissions.send_messages is False:
+        if permissions.administrator:
+            return False, T_(mute_unmute_issues["is_admin"])
+
+        new_overs = {}
+        if not isinstance(channel, discord.TextChannel):
+            new_overs.update(speak=False)
+        if not isinstance(channel, discord.VoiceChannel):
+            new_overs.update(send_messages=False, add_reactions=False)
+
+        if all(getattr(permissions, p) is False for p in new_overs.keys()):
             return False, T_(mute_unmute_issues["already_muted"])
 
         elif not await is_allowed_by_hierarchy(self.bot, self.settings, guild, author, user):
             return False, T_(mute_unmute_issues["hierarchy_problem"])
 
-        perms_cache[str(channel.id)] = {
-            "send_messages": overwrites.send_messages,
-            "add_reactions": overwrites.add_reactions,
-        }
-        overwrites.update(send_messages=False, add_reactions=False)
+        old_overs = {k: getattr(overwrites, k) for k in new_overs}
+        overwrites.update(**new_overs)
         try:
             await channel.set_permissions(user, overwrite=overwrites, reason=reason)
         except discord.Forbidden:
             return False, T_(mute_unmute_issues["permissions_issue"])
         else:
-            await self.settings.member(user).perms_cache.set(perms_cache)
+            await self.settings.member(user).set_raw(
+                "perms_cache", str(channel.id), value=old_overs
+            )
             return True, None
 
     @commands.group()
@@ -1061,37 +1047,39 @@ class Mod(commands.Cog):
     ):
         """Unmute a user in their current voice channel."""
         user_voice_state = user.voice
+        guild = ctx.guild
+        author = ctx.author
         if user_voice_state:
             channel = user_voice_state.channel
-            if channel and channel.permissions_for(user).speak is False:
-                overwrites = channel.overwrites_for(user)
-                overwrites.speak = None
-                audit_reason = get_audit_reason(ctx.author, reason)
-                await channel.set_permissions(user, overwrite=overwrites, reason=audit_reason)
-                author = ctx.author
-                guild = ctx.guild
-                await ctx.send(
-                    _("Unmuted {}#{} in channel {}").format(
-                        user.name, user.discriminator, channel.name
-                    )
+            if channel:
+                audit_reason = get_audit_reason(author, reason)
+
+                success, message = await self.unmute_user(
+                    guild, channel, author, user, audit_reason
                 )
-                try:
-                    await modlog.create_case(
-                        self.bot,
-                        guild,
-                        ctx.message.created_at,
-                        "voiceunmute",
-                        user,
-                        author,
-                        reason,
-                        until=None,
-                        channel=channel,
+
+                if success:
+                    await ctx.send(
+                        _("Unmuted {user} in channel {channel.name}").format(
+                            user=user, channel=channel
+                        )
                     )
-                except RuntimeError as e:
-                    await ctx.send(e)
-            elif channel.permissions_for(user).speak:
-                await ctx.send(_("That user is already unmuted in {}!").format(channel.name))
-                return
+                    try:
+                        await modlog.create_case(
+                            self.bot,
+                            guild,
+                            ctx.message.created_at,
+                            "vunmute",
+                            user,
+                            author,
+                            reason,
+                            until=None,
+                            channel=channel,
+                        )
+                    except RuntimeError as e:
+                        await ctx.send(e)
+                else:
+                    await ctx.send(_("Unmute failed. Reason: {}").format(message))
             else:
                 await ctx.send(_("That user is not in a voice channel right now!"))
         else:
@@ -1109,8 +1097,9 @@ class Mod(commands.Cog):
         channel = ctx.channel
         author = ctx.author
         guild = ctx.guild
+        audit_reason = get_audit_reason(author, reason)
 
-        success, message = await self.unmute_user(guild, channel, author, user)
+        success, message = await self.unmute_user(guild, channel, author, user, audit_reason)
 
         if success:
             await ctx.send(_("User unmuted in this channel."))
@@ -1141,16 +1130,11 @@ class Mod(commands.Cog):
         """Unmute a user in this server."""
         guild = ctx.guild
         author = ctx.author
+        audit_reason = get_audit_reason(author, reason)
 
         unmute_success = []
         for channel in guild.channels:
-            if not isinstance(channel, discord.TextChannel):
-                if channel.permissions_for(user).speak is False:
-                    overwrites = channel.overwrites_for(user)
-                    overwrites.speak = None
-                    audit_reason = get_audit_reason(author, reason)
-                    await channel.set_permissions(user, overwrite=overwrites, reason=audit_reason)
-            success, message = await self.unmute_user(guild, channel, author, user)
+            success, message = await self.unmute_user(guild, channel, author, user, audit_reason)
             unmute_success.append((success, message))
             await asyncio.sleep(0.1)
         await ctx.send(_("User has been unmuted in this server."))
@@ -1171,45 +1155,37 @@ class Mod(commands.Cog):
     async def unmute_user(
         self,
         guild: discord.Guild,
-        channel: discord.TextChannel,
+        channel: discord.abc.GuildChannel,
         author: discord.Member,
         user: discord.Member,
+        reason: str,
     ) -> (bool, str):
         overwrites = channel.overwrites_for(user)
-        permissions = channel.permissions_for(user)
         perms_cache = await self.settings.member(user).perms_cache()
 
-        if overwrites.send_messages or permissions.send_messages:
+        if channel.id in perms_cache:
+            old_values = perms_cache[channel.id]
+        else:
+            old_values = {"send_messages": None, "add_reactions": None, "speak": None}
+
+        if all(getattr(overwrites, k) == v for k, v in old_values.items()):
             return False, T_(mute_unmute_issues["already_unmuted"])
 
         elif not await is_allowed_by_hierarchy(self.bot, self.settings, guild, author, user):
             return False, T_(mute_unmute_issues["hierarchy_problem"])
 
-        if channel.id in perms_cache:
-            old_values = perms_cache[channel.id]
-        else:
-            old_values = {"send_messages": None, "add_reactions": None}
-        overwrites.update(
-            send_messages=old_values["send_messages"], add_reactions=old_values["add_reactions"]
-        )
-        is_empty = self.are_overwrites_empty(overwrites)
-
+        overwrites.update(**old_values)
         try:
-            if not is_empty:
-                await channel.set_permissions(user, overwrite=overwrites)
-            else:
+            if overwrites.is_empty():
                 await channel.set_permissions(
-                    user, overwrite=cast(discord.PermissionOverwrite, None)
+                    user, overwrite=cast(discord.PermissionOverwrite, None), reason=reason
                 )
+            else:
+                await channel.set_permissions(user, overwrite=overwrites, reason=reason)
         except discord.Forbidden:
             return False, T_(mute_unmute_issues["permissions_issue"])
         else:
-            try:
-                del perms_cache[channel.id]
-            except KeyError:
-                pass
-            else:
-                await self.settings.member(user).perms_cache.set(perms_cache)
+            await self.settings.member(user).clear_raw("perms_cache", str(channel.id))
             return True, None
 
     @commands.group()
@@ -1695,20 +1671,15 @@ class Mod(commands.Cog):
                 while len(nick_list) > 20:
                     nick_list.pop(0)
 
-    @staticmethod
-    def are_overwrites_empty(overwrites):
-        """There is currently no cleaner way to check if a
-        PermissionOverwrite object is empty"""
-        return [p for p in iter(overwrites)] == [p for p in iter(discord.PermissionOverwrite())]
-
 
 _ = lambda s: s
 mute_unmute_issues = {
     "already_muted": _("That user can't send messages in this channel."),
-    "already_unmuted": _("That user isn't muted in this channel!"),
+    "already_unmuted": _("That user isn't muted in this channel."),
     "hierarchy_problem": _(
-        "I cannot let you do that. You are not higher than " "the user in the role hierarchy."
+        "I cannot let you do that. You are not higher than the user in the role hierarchy."
     ),
+    "is_admin": _("That user cannot be muted, as they have the Administrator permission."),
     "permissions_issue": _(
         "Failed to mute user. I need the manage roles "
         "permission and the user I'm muting must be "
diff --git a/redbot/cogs/streams/streams.py b/redbot/cogs/streams/streams.py
index 901ca6803..9665b4755 100644
--- a/redbot/cogs/streams/streams.py
+++ b/redbot/cogs/streams/streams.py
@@ -626,8 +626,13 @@ class Streams(commands.Cog):
             raw_stream["_messages_cache"] = []
             for raw_msg in raw_msg_cache:
                 chn = self.bot.get_channel(raw_msg["channel"])
-                msg = await chn.get_message(raw_msg["message"])
-                raw_stream["_messages_cache"].append(msg)
+                if chn is not None:
+                    try:
+                        msg = await chn.get_message(raw_msg["message"])
+                    except discord.HTTPException:
+                        pass
+                    else:
+                        raw_stream["_messages_cache"].append(msg)
             token = await self.db.tokens.get_raw(_class.__name__, default=None)
             if token is not None:
                 raw_stream["token"] = token
@@ -646,8 +651,13 @@ class Streams(commands.Cog):
             raw_community["_messages_cache"] = []
             for raw_msg in raw_msg_cache:
                 chn = self.bot.get_channel(raw_msg["channel"])
-                msg = await chn.get_message(raw_msg["message"])
-                raw_community["_messages_cache"].append(msg)
+                if chn is not None:
+                    try:
+                        msg = await chn.get_message(raw_msg["message"])
+                    except discord.HTTPException:
+                        pass
+                    else:
+                        raw_community["_messages_cache"].append(msg)
             token = await self.db.tokens.get_raw(_class.__name__, default=None)
             communities.append(_class(token=token, **raw_community))
 
diff --git a/redbot/core/__init__.py b/redbot/core/__init__.py
index b4dd05d5b..d3b2c08b3 100644
--- a/redbot/core/__init__.py
+++ b/redbot/core/__init__.py
@@ -148,5 +148,5 @@ class VersionInfo:
         )
 
 
-__version__ = "3.0.0rc1.post1"
+__version__ = "3.0.0rc2"
 version_info = VersionInfo.from_str(__version__)
diff --git a/redbot/core/bank.py b/redbot/core/bank.py
index 840721147..27b2866e2 100644
--- a/redbot/core/bank.py
+++ b/redbot/core/bank.py
@@ -4,9 +4,10 @@ from typing import Union, List, Optional
 
 import discord
 
-from redbot.core import Config
+from . import Config, errors
 
 __all__ = [
+    "MAX_BALANCE",
     "Account",
     "get_balance",
     "set_balance",
@@ -26,6 +27,8 @@ __all__ = [
     "set_default_balance",
 ]
 
+MAX_BALANCE = 2 ** 63 - 1
+
 _DEFAULT_GLOBAL = {
     "is_global": False,
     "bank_name": "Twentysix bank",
@@ -170,10 +173,22 @@ async def set_balance(member: discord.Member, amount: int) -> int:
     ------
     ValueError
         If attempting to set the balance to a negative number.
+    BalanceTooHigh
+        If attempting to set the balance to a value greater than
+        ``bank.MAX_BALANCE``
 
     """
     if amount < 0:
         raise ValueError("Not allowed to have negative balance.")
+    if amount > MAX_BALANCE:
+        currency = (
+            await get_currency_name()
+            if await is_global()
+            else await get_currency_name(member.guild)
+        )
+        raise errors.BalanceTooHigh(
+            user=member.display_name, max_balance=MAX_BALANCE, currency_name=currency
+        )
     if await is_global():
         group = _conf.user(member)
     else:
diff --git a/redbot/core/bot.py b/redbot/core/bot.py
index 607a61b27..d09a87a5a 100644
--- a/redbot/core/bot.py
+++ b/redbot/core/bot.py
@@ -1,4 +1,5 @@
 import asyncio
+import inspect
 import os
 import logging
 from collections import Counter
@@ -236,20 +237,13 @@ class RedBase(commands.GroupMixin, commands.bot.BotBase, RPCMixin):
         if cog is None:
             return
 
-        for when in ("before", "after"):
+        for cls in inspect.getmro(cog.__class__):
             try:
-                hook = getattr(cog, f"_{cog.__class__.__name__}__red_permissions_{when}")
+                hook = getattr(cog, f"_{cls.__name__}__permissions_hook")
             except AttributeError:
                 pass
             else:
-                self.remove_permissions_hook(hook, when)
-
-        try:
-            hook = getattr(cog, f"_{cog.__class__.__name__}__red_permissions_before")
-        except AttributeError:
-            pass
-        else:
-            self.remove_permissions_hook(hook)
+                self.remove_permissions_hook(hook)
 
         super().remove_cog(cogname)
 
@@ -390,10 +384,17 @@ class RedBase(commands.GroupMixin, commands.bot.BotBase, RPCMixin):
             )
         if not hasattr(cog, "requires"):
             commands.Cog.__init__(cog)
+
+        for cls in inspect.getmro(cog.__class__):
+            try:
+                hook = getattr(cog, f"_{cls.__name__}__permissions_hook")
+            except AttributeError:
+                pass
+            else:
+                self.add_permissions_hook(hook)
+
         for attr in dir(cog):
             _attr = getattr(cog, attr)
-            if attr == f"_{cog.__class__.__name__}__permissions_hook":
-                self.add_permissions_hook(_attr)
             if isinstance(_attr, discord.ext.commands.Command) and not isinstance(
                 _attr, commands.Command
             ):
diff --git a/redbot/core/errors.py b/redbot/core/errors.py
index ca9f4f9b4..a67097dc0 100644
--- a/redbot/core/errors.py
+++ b/redbot/core/errors.py
@@ -1,4 +1,11 @@
 import importlib.machinery
+from typing import Optional
+
+import discord
+
+from .i18n import Translator
+
+_ = Translator(__name__, __file__)
 
 
 class RedError(Exception):
@@ -21,3 +28,24 @@ class CogLoadError(RedError):
     The message will be send to the user."""
 
     pass
+
+
+class BankError(RedError):
+    """Base error class for bank-related errors."""
+
+
+class BalanceTooHigh(BankError, OverflowError):
+    """Raised when trying to set a user's balance to higher than the maximum."""
+
+    def __init__(
+        self, user: discord.abc.User, max_balance: int, currency_name: str, *args, **kwargs
+    ):
+        super().__init__(*args, **kwargs)
+        self.user = user
+        self.max_balance = max_balance
+        self.currency_name = currency_name
+
+    def __str__(self) -> str:
+        return _("{user}'s balance cannot rise above {max:,} {currency}.").format(
+            user=self.user, max=self.max_balance, currency=self.currency_name
+        )