Comment 2 for bug 150697

Workaround: set backend from gconf to flat-file. This bug is actually somewhere in gconf, because compiz uses standard windowmanager keys for shortcuts. Also, you will have some problems, when trying to use Super key as modifier, since standard keybinding tool doesn't support it as modifier, but ccsm does.

WARNING: when changing backend, be sure you saved all work you need! Because switching backend procedure often crashes compiz!

P.S. to have all your settings with other backend export settings, switch backend, then import them back.