[renowner]

Not 100% Certain these are actually bugs and unintended, but I feel like they could be.
If you're in the chat tab, and untoggle system text, it also toggles off your guild chat. I really don't think this should happen. There's even a separate toggle for guild chat, that doesn't toggle off system chat either. If i'm chopping seeds, I want to be able to not see all of my seed chat spam me, but I still want to see my guild chat! Additionally, toggling off ooc chat also toggles off looc chat. I feel like that's also not something that should happen, we have a looc toggle separately as well.

[renowner]

Still an issue as of version 2.68.
Toggling off system messages in the chat tab still disables guild chat as well, despite guild chat already having its own dedicated toggle.

[WaifuApple]

I have OOC chat toggled off and that doesn't toggle LOOC off for me, and never really has. System chat, however, I can confirm does seem to toggle off guild chat.

[renowner]

Still seems to be an issue as of 2.73d.
If guild chat has already been posted and you toggle off system chat, it stays.
But any guild chats posted while system chat is toggled off, is invisible forever in the chat tab.
(They all remain visible in the all tab, however)

[Neus]

This has been corrected in 2.75.