Turn off hardware acceleration in the performance prefs.
I'll try that...why would I need to do that though now after it working fine in the past?
What does that do?
Because there are known video driver bugs in MacOS 10.10 that were not in MacOS 10.9 (or previous versions).
Apple is aware of the MacOS 10.10 bugs, and working on solutions.
Ok guys thanks!
where is it? In CS6, under Preferences-Performance I don't see a Hardware Acceleration option?!?