After about 45 mins. of waiting here is the official word from Customer Support (PlayOnline).
Q. Have you guys hear of this issue?
A. No this is the first time I've heard of it, let me ask around (waits 15 mins). Ah yes we've been receiving calls about this today.
Q. So there is no answer to this solution?
A. What video card are you using.
- 7900GTX NVIDIA
Q. So what should we do?
A. I recommend you go to playonline under e-mail support to file a bug request. If we receive enough emails we can issue an emergency patch.
Q. Do people actually check that thing?
A. Yes.
So I recommend everyone to file an email bug report about this issue. If we're lucky we can get a patch fix by January.
XI Wiki

