I have seen it a few times on mine too.
Dell M1330 with Intel graphics.

I'm considering to un-tick "Sync To VBlank" as mentioned above, as I have had 
issues with clutterflow before.
The solution for that is to add
 export CLUTTER_VBLANK=none
to /etc/environment

-- 
You received this bug notification because you are a member of compiz
packagers, which is subscribed to compiz in Ubuntu.
https://bugs.launchpad.net/bugs/740126

Title:
  Something blocks compiz randomly several times per day

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