I had that problem awhile ago and it turned out to be compiz freewins.
Try turning that plugin off and see if that fixes it.
jen
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ive got an interesting problem with my ubuntu gutsy box
im running compiz-fusion and also running kiba,
all has been good for 3 months but i recently turned of my box for a week, upon
turning it on it intermittantly makes the control panel no longer respond by
control panel i mean the panel t