Comment 4 for bug 256972

Please note that this bug was also present in Gutsy and Hardy -- it has been an ongoing problem. See the comments in this bug for details:
https://bugs.launchpad.net/ubuntu/hardy/+source/compiz/+bug/99508

there was a fix released, the only change being on line 28 of (/usr/share/themes/Human/metacity-1/metacity-theme-1.xml), but apparently something's broken again.