Strange yellow spots on applications when moved around.
My iMac has been having this strange problem as of late. Whenever I drag a application window around the desktop, yellow spots start to appear all over the window. I have a screenshot of this problem below.
This looks like a driver problem, but I can't find any threads with this same problem.
Any ideas?
Thanks for your help.
iMac, Mac OS X (10.7.3), 27in Late 09, Radeon HD 4850 512MB