I noticed today that screen shot are not working for me any more. The last successful screenshot was taken on 2/17/2010 at 9:51PM EDT. Today when I press the print screen button nothing happens and there are no new screen shot image files in the screenshot folder. I still have all my old ones but nothing after 2/17.
Supplemental: I tried resetting my video options to default but still can't take screen shots. Also, the other day three screen shots showed up as .TGA instead of JPG. This makes me think there is something in the game that changes how screen shots are taken and that somehow it got turned of or is silently failing.