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I'm running Ubuntu 12.04 and whenever I go into the preferences of eclipse I get a grey bar covering all my windows. when I exit eclipse the bar doesn't disappear. I'm running sun-java but it happens with openjava, too. Is there a command I can execute to kill the grey bar? Or even better, how do I stop it from happening? I have to log out and back in to get rid of it.

The grey bar is approximately 200x30 pixels and tends to show up towards the top of the screen.

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