Talking with several folk in the arena this evening seems a problem I suffered 3 or 4 days ago is common.
I was adjusting my GAMMA setting (in the AH Setup Menu) when my screen went brillant white and that was all she wrote.
I had to Ctrl-Alt-Delete to get out of the program. My desktop was toasted (brilliant white.. could barely make out icons).
Rebooted my machine (twice) and everything was fine, with all programs except AH. Soon as I started AH up again... WHAM.... same problem.
I finally deleted all AH (using the windows add or remove) and reloaded the whole program. No more problems (so far).
System
AMD Athlon XP3200+
2.19Ghz w/1GB RAM
NVIDIA GeForce 6600GT w/128Mb Ram
Game video setting 1280 x 1024.
One of the other players I spoke with was running at 1280 x 1024 also.