Just for kicks and giggles, have you tried a master reset of the C8 by unplugging it for a minute or so? I had to do that with my C8 after the most recent firmware update.So, adding to this... I realized that this issue cropped up at the same time that my Classe shorted on me (I crossed two live ends of a speaker wire, dumb accident through carelessness). The amp went up in smoke and the subwoofer popped. Is it possible that the amp sent a short that traveled through my processor to the C8 and damaged it? I just can't think of another reason why the TV's performance would have gotten so much crappier all at once. I've A-B'd content on the C8 and my C7, and it's night and day... skies in the C8 are full of dancing "grain"/artificating/etc., whereas the same content is beautiful and smooth on the C7 (which has been ISF calibrated). The C8 didn't look this way before. Is it even possible that the short damaged the TV, or have I got another issue on my hands?