I have the same exact problem and it is the same as stated in this thread: http://larian.com/forums/ubbthreads.php?ubb=showflat&Number=610874#Post610874

This problem has been in the game since EA and there is no solution to it and it's all on Larians side things. Updating or reverting to old drivers does not fix the problem. Trust me I've tried, a lot...