Found the offending assertion in mesa:
http://bazaar.launchpad.net/~ubuntu-branches/ubuntu/natty/mesa/natty-updates/view/head:/src/mesa/main/mipmap.c
** Package changed: compiz (Ubuntu) => mesa
** Also affects: mesa (Ubuntu)
Importance: Undecided
Status: New
** Changed in: mesa (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/684745
Title:
Alt-tab causes compiz assert failure: compiz: main/mipmap.c:43:
bytes_per_pixel: Assertion `b >= 0' failed.
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