I have had the same issue for 6+ months now trying to run campaigns. I've re-installed a few times when I've had the time but no success. Doesn't really bother me until I start thinking about how I paid money for the thing. And how I hate that you have to almost be a second tier coder or PC repair expert to play a PC game nowadays.
Seems like this issue might warrant someone taking a serious look at it; considering more than a few users are experiencing the same frustrations.