While using windowed mode, if i'm on a loading screen and i click off to read these forums or do something else-- client hangs during the load. If i click back on the client it just shuts down-- no error message, no report form.. nothing. Its like as if i hit Alt+f4.

Using Vista 64 bit, 4 gigs ram, AMD 5000+ dual core, dual monitors, HD4850 video card