Context menus change vertical size

Sometimes context menus grow and shrink when you move the mouse up and down them. I have had this on two machines, one desktop and one laptop, both running compiz from the unity team ppa.

alan@wopr:~$ apt-cache policy compiz
compiz:
  Installed: 1:0.9.7.2-0ubuntu1~ppa2
  Candidate: 1:0.9.7.2-0ubuntu1~ppa2
  Version table:
 *** 1:0.9.7.2-0ubuntu1~ppa2 0
        500 http://ppa.launchpad.net/unity-team/ppa/ubuntu/ precise/main amd64 Packages
        100 /var/lib/dpkg/status
     1:0.9.7.0+bzr3035-0ubuntu1 0
        500 http://gb.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages

Tried filing the bug with ubuntu-bug compiz but it wouldn't let me, because it's not an official package.

http://www.youtube.com/watch?v=2ZxYN2zuS1E