I'm not sure if this is the way its really suppose to work or not, but alt + prt scr or just prt scr doesn't take a screen shot of the game it takes if of what ever in the background. Not sure if this is a windows thing some how though but all my other games seem to work just fine. Anyways this would be something very helpful for us in bug reported for you guys. I didn't learn this until I was trying to take a few SS to add to a bug report.
- Legacy ID
- Not Fixable
Are you launching from Steam? If you are, steam has it's own hotkey for screenshots which is f12 I think (I've changed mine).
Using FRAPS allows me to use the Printscreen key (kind of annoying, but it auto saves every screenshot I take. There are probably other screenshot applications our there.