Re: compiz
I use Xfce, so things may be a tad different. My Settings menu includes Panel, and on the Display tab I have an option to automatically show and hide the Panel. If it's checked, the panel is barely visible on the edge of the screen unless I move the mouse onto it. Check with your control panels to see if you have the same thing. I mention this because I too use Compiz, and it doesn't control the panel.
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