Hi there: I'm running Photoshop CS4 on an iMac 27 inch - Processor 3.4 GHz Intel Core i7 / Memory 8 GB 1333 MHz DDR3 / Graphics AMD Radeon HD 6970M 2048 MB / OS X 10.8.2.
Ever since buying the Mac I've had problems with what I can only describe as flashing, bitmap images around the main image but not within it. This problem mostly occurs at the top of the screen (in the 'Rulers' area)
but occassionally happens to the left and right of the image too. I've reached the limits of my 'tech' expertise and trashed the Preferences a couple of times but I still have the problem.
I found one similar problem on the forums but not the same as it was all over the screen and required a complete reboot; I only need to quit Photoshop or ignore it - although it is very distracting!
Their problem was the video card, could this be the same? Very grateful if anyone can shed light.