GObonzo,
I didn't think of this until now...I went from two (x2) ATI x1950 xt's to one (x1) ATI HD5770. My point being I went from two physical cards to one card. It's a long shot, but try pulling one video card and running the game?
I know it sounds stupid, but that's all I can think of.
Video driver version, as reported by Win7:
Provider: ATI Technologies
Date: 3/2/2010
Version: 8.712.0.0
Good Luck,
~Rasstis
P.S. Link with all my notes:
http://www.larian.com/forums/ubbthreads.php?ubb=showflat&Number=411427#Post411427 ~R