Last night my computer froze after a random amount of gameplay. When it did it again, I tried playing with my background applications and cleared world cache.
Background applications were MSN and two web browsers. Tried playing systematically with both open, one open, both closed.
I still got the random freezing and had to hard reboot. After clearing my cache for the second time, I then opened Ventrillo and continued playing.
Half the time, the world wouldn't load or I'd get these client crashes. It's not freezing! so it's progress!
I also had trouble with grouping most of the night. Where I could join, but see no arrows or group window, but everyone was in group chat. The game would insist I was not in a group and that I couldn't leave because I had no group.
Random freezing continued after about I got a good 20 mins of this strange behaviored game play in. I do not have this issue with other MMOs.