With the Mac client, some dungeons, i.e. "The Riddle" are completely unplayable. At some point the entire screen goes blue, and I can't see anything, including my character.
This happens all over the place, and had been getting better, but still that one, parts of VON (Haywire foundry), simply go all blue/orange/whatever, and you can't see anything unless you very slowly rotate.
trying to bounce the client may work, but half the time, you have to reboot as the client won't relaunch in that state. Since the client writes nothing to the logs whatsoever, (a VERY bad, and almost rude thing for a beta to do. If you're releasing public betas, have said beta log. Thoroughly), there's no way to tell what's going on.
So you get bug reports like this which say "IT DON'T WORK RIGHT, MAKE IT WORK GOODER".