Just thought I would add, too, I am running a Radeon Mobility HD4670 (on Dell Studio XPS 16) and the problem persisted even after installing the very latest drivers from ATI's website this afternoon.
I suspect the problem is Win7 64-bit (WOW layer?) related, rather than being a video driver, but I do hope that there's a 2.05 "patch patch" or a 2.051 or something, as I am missing the game already! (I know that's sad).
Regards
Neil