I had the same problem, wanted to set <shift><control>Escape as a shortcut for gnome-system-monitor.
I found the simplest way to do it in ubuntu using gnome shortcuts instead.
System -> Preferences -> Keyboard Shotcuts, just create a new shortcut (Add) there and it will work.
It still would be good to have that bug corrected in compiz ;)
I had the same problem, wanted to set <shift> <control> Escape as a shortcut for gnome-system- monitor.
I found the simplest way to do it in ubuntu using gnome shortcuts instead.
System -> Preferences -> Keyboard Shotcuts, just create a new shortcut (Add) there and it will work.
It still would be good to have that bug corrected in compiz ;)