I can't attach a screenshot or post a link to a screenshot but essentially everything is REALLY bright, I can't see anything except silhouettes and the HUD, anyone else having issues like this? Game was running fine for a good 3 hours, then it just happened and it won't go away.

Overheating GPU? When was the last time you blew out the dust on your video card? I recently changed my video card and it was amazing how much crap there was in my old one.

I wouldn't say it's overheating, I have a 290x and it sits between 65-70 Celsius during play, is that bad?