Hey Alex, I just wanted to say that I'm really excited about this game and I'm ready to spend my $20 as soon as this bug is fixed, and it sounds like I may not the be the only one, so at least you should get some more sales from your efforts on this particular bug!
Unfortunately I have these symptoms on both my machines so I haven't been able to experience the game yet. One has an mobile Intel 965 (Windows 7) and the other is actually an ATI Radeon Mobility 1400 (Vista). I thought it odd that most people on this thread were talking about Intel problems when it also occurred with my machine with the ATI card. I'll post more detailed specs in a moment on that computer, since I don't have access to it at the moment.