by AverageJoe » Fri Aug 21, 2015 7:03 pm
Try deleting the "chat-cache.txt" file in your World of Warcraft Class\WTF\Account\%account name%\Nostalrius Begins\%character name% folder. The file should recreate next time you launch WoW, login, logout, and close and reset chat settings to default values.
If that doesn't work, try deleting your entire WTF folder in the WoW Classic folder. Same thing: it'll recreate with default values next time you login/out and close WoW. You'll lose any custom addon, macro, and UI settings, but it clears the entire cache of your account settings including chat and UI stuff.