As you noticed Super+m is used for the indicator applet which is why you can't use it for any compiz actions. This is not a bug but the expected result.
** Changed in: compiz (Ubuntu) Status: New => Invalid -- Can't assign super+m for compiz actions https://bugs.launchpad.net/bugs/557917 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs