If you crash send the clinet and crash log to the bug tracker thread on forums please.the crash log and client log are at the log folder in game directory.
It's so close to release, so don't expect it to be stable.
In the time being, just sit back and relax, I'm sure every crash/fault is there for a reason!
I think I found the problem, tested it 4x and it worked everytime.
Due to my impatience I usually alt tabbed during the loading (takes forever!:P) and every time I did it never went past Loading Zones, however if I sit through it (it's a struggle!) without alt tabbed, it loads just fine after a couple minutes.
I'm not sure if it's any help at all, but it definitely works.