Hi all the experts out there, After I installed OS X El Capitan Version 10.11, a very irritating problem started occurring while i'm working on my iMac. Basically, whenever i'm in full screen mode using an application (Sketchup to be exact), after a while the window will suddenly and automatically slide away and minimised on its own, revealing the windows and desktop behind. This has been repeating non-stop whenever I try to work on something in a full screen mode. Please help me! What can I do???