I have used Photoshop 7, CS2, CS3, CS5, CS6 on this same system. They all work fine on my system. I have not changed anything on my system.
- Did the problem start when you upgraded to Photoshop CC, or did it work right with Photoshop CC at some point then come on?
It never worked in CC. Still works perfect in CS6.
- What video card do you have, and what driver version?
Geforce GTX 460 , Driver v. 9.18.13.1106
- What 3rd party plug-ins do you have?
Only Portraiture.
- Do you have any 3rd party UI theme changing or other software on your system that not everyone uses?
No.
- Have you tried resetting the Clone Stamp Tool?
Yes. Made no difference.
- Have you tried changing the Advanced GPU Drawing Mode to a lower setting (making sure to restart Photoshop after)?
Yes. Made no difference.
- Have you tried resetting all Photoshop preferences to defaults?
Yes. Made no difference.