This has happened a handful of times on mine as well. I have had my unit for just about 2 years. Resetting the power always did the trick. I don't play my 360 more than 4 hours a week though - I think I need a marathon gaming session to break this thing ( if it's even going to ) before the warranty runs out.
It looks like the context sensitive Guide Background before the bilinear filtering takes place. You know, like when you hit your Guide button in game, then is shows a blurry version of the game image behind your guide? I'd guess that some part of the software thought the Guide was open, but every other part knew that it wasn't.
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