During the scenario I was having a lot of mini-maxi-window toggling happening on its own. On a hunch I disabled my screensaver and haven't had it since. Running Win7 x64, the "blank" windows screensaver set to 2 or 3 minutes. I think (guessing) AH isn't taking focus and windows is thinking the PC is idle, and the game freaks out when windows tries to launch the screen saver.