Just adding another to the list of people having troubles with this. Radeon HD 7850 on Windows 7 x64, 8gb RAM. Definately isn't an issue with my PC as I can run several other games on max without a single problem. It's isolated to FFXIV and several models of GPU; mostly people with AMD cards but there have been a few nVidia issues posted.

Interesting to note, since 2.35 I have gotten a different type of error. Occasionally, it will tab out and tell me there's been an unexpected error, but when I Alt-Tab back to the game window it's in a strange limbo world. All animations and effects are frozen, but you can zoom around and click on things (obviously, nothing happens). You can't do anything other than click "OK" on the error window, which will then shut the game down. Usually after that, it will not load up again (hangs on the transition between launcher and fullscreen ffxiv.exe) and needs to be soft rebooted...

No joy getting a response here, so perhaps we need to contact AMD if people haven't already.