Maintenance for the week of July 13:
• PC/Mac: No maintenance – July 13
The issues on the North American and European PlayStation® megaservers have been resolved at this time. If you continue to experience difficulties at login, please restart your client. Thank you for your patience!
Sounds like something bugged with the quick-slot wheel; does Q still work? I had something similar a long time ago where I somehow ended up with absolutely no chat window. Did the error come back after /reloadui ?