I confirmed the same symptom on my system in gnome under Ubuntu 8.10.
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Setting key kombination doesn't work any long
https://bugs.launchpad.net/bugs/306441
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*** This bug is a duplicate of bug 293789 ***
https://bugs.launchpad.net/bugs/293789
** This bug has been marked a duplicate of bug 293789
keyboard shortcuts conflicting (stopped working)
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Setting key kombination doesn't work any long
https://bugs.launchpad.net/bugs/306441
You received
** Attachment added: Dependencies.txt
http://launchpadlibrarian.net/20318056/Dependencies.txt
** Attachment added: ProcMaps.txt
http://launchpadlibrarian.net/20318057/ProcMaps.txt
** Attachment added: ProcStatus.txt
http://launchpadlibrarian.net/20318058/ProcStatus.txt
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Setting key