Recently I reloaded my OS partition. Was suprised at the constant lockups I got in AH. I've got a seperate partition for AH and even reloaded AH to no avail.
I started changing my drivers for vid and audio cards but was limited to audio drivers for my Creative XFI Gamer Extream card to those on the Creative site which are beta drivers. Finaly out of frustration, and lockups every time I tried to run AH, I searched for some older sound drivers. Problem solved!
Haven't had a lockup in two weeks and the game runs like I expected it to after an OS reload.
My vid card, a GeForce 6800 GT runs better with old 84.66 drivers than the new ones nVidia offers also.
Just a thought, drivers can be the root cause of a lot of lockup issues.
Edit to add, didn't read the entire thread, seems Skuzzy has ID'd some other prob. Still, driver issues are a pain in the tush.