I was getting a problem with every image I brought into PS CC. They all appeared with wild and crazy color grain in patterns spread all over the image. I tried all sorts of suggestions from "experts" and even system restore. I opened my copy of CS6 and all the images were sharp and pure...it was just CC. I noticed a few suggestions for other problems that were helped by going to "Help > Updates" so I tried that and it works great now. I hope it continues.