see if it does the same thing?
Hi, I suddenly have strange Graphic problems with my iMac. During working it started all of a sudden to display all system panels scrambled or black. System panels in the finder but as welll the dock and system bar. The problem kept staying after restart and logging in as new user. When I start in "safe mode" everything is displayed fine. I once booted regulary and the problem was gone just to reappear after a few minutes. I think this indicates that is rather a software thing.
HELP, I don't know what to do here..is there a solution despite installing everything new?
3.06 GHz Intel Core 2 Duo, 12 GB 1067 MHz DDR, ATI Radeon HD 4850 512 MB, OSX El Capitan, 10.11.1
Here a Screenshot: