I've had the same issue with a Nvidia GTX 3 months ago, I was wondering why my Nyx was grey all the way and though 'oh blodo, what have u done. (sarcastically ofc (: )'. I've solved this the most simple way. Reinstalled the OS, it was necessary anyways due to other reasons.
However, it looks like a directX rendering issue to me. I don't know but, probably run dxdiag and look up device manager for suspicious activities? I guess, you've done that already anyways...
