I am running windows 7 64 bit and Photoshop CC 64 Bit. After upgrading from PS CS6 to PS CC I have encountered issues with Photoshop CC correctly rendering pictures that worked just fine in CS6. The issue appears to be in how I have my graphics card set up in preferences. I have a Radeon HD 7770. The Adobe web site says this card is Supported. The problem is intermittent. Out of 10 times I open the same picture 60% of the file openings will not be rendered correctly. The issue shows as black grouping of pixels in various locations of the picture. Under the preferences option in the performance window I typically have run with the Advanced option set. I backed off to Normal but the issue continued. I then changed the option to Basic and the issue occurs less frequently. After a lengthy discussion with Adobe support they said I needed to change my graphic card. This is an expensive solution. Is a new graphic card my only option?
Update your video card driver from AMD's website.
Updating the driver and associated software appears to have fixed the problem. My computer vendor said my video card drivers were current? The pictures now display correctly consistently. I will continue to monitor. Thank you for your help.