ever since ive upgraded my retina MBP to Mavericks i noticed that iTunes Videos in Full Screen flicker at the bottom and top while the controls are on the screen. it goes back to normal once the itunes controls fade away. sometimes i notice what seems to be one of those push "bubbles" e. g. iMessage to be stuck on top when it flickers. oh it also flickers when i pause the video and get a push notification while in full screen mode. anyone else?