Strange OSX Lion bug???

Nov 15, 2011
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My iMac has developed this strange problem, basically what ever window I'm using suddenly disappears in to the background and the only way to bring it back is with the mouse and selecting it.
This happens with all menus that have a drop down menu and seems to happen randomly when I'm typing as well, i have attached a video of the problem but i am completely stumped!
This is on an iMac 24" running Lion with all the latest updates.
Thanks to anyone that can solve this amazingly annoying problem!
Annoying bug! - YouTube

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