So, I tried searching on this but wasn't able to find an answer. Sometimes, say after I open something in Preview, and then close it, the entire TOP menu bar will disappear. Sometimes, only all the icons on the RIGHT side of the menu bar will disappear? I'm not in full screen mode on any of these applications, and a click on the finder or front most app will bring it all back, but I can't for the life of me figure out why it is happening. Here is a screenshot with the issue. This is 10.8.2 (without the supplemental added) on a stock out of the box MBRr, 15" that just came from the factory.