I have exactly the same problem in a fresh Gutsy with an Intel video card.
Did you find out something since September ?
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compiz with mplayer (fullscreen) crashes X
https://bugs.launchpad.net/bugs/147453
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Bugs, which is the bug
I solved this problem by switching my keyboard to International English
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"shift + backspace" causes gnome crash
https://launchpad.net/bugs/81071
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