[Stirling]

I have this problem, too. It is intermittent and very brief, and appears to be a rise in gamma. I play in 800x600 fullscreen.

I've only seen it when looking at the map. It may be happening on menu screens as well, but I haven't noticed it. I've never alt-tabbed out and have very little running in the background.

I've included my DxDiag file.