Thanks for reporting this bug and help to make ubuntu better.
Can you pease get a stacktrace as described there:
https://wiki.ubuntu.com/UnityFilingBugs
** Package changed: mutter (Ubuntu) => clutk (Ubuntu)
** Changed in: clutk (Ubuntu)
Status: New => Incomplete
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mutter segfault libclutk
https://bugs.launchpad.net/bugs/666447
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