I'm having the same issue it started happening after updating. I'm a
macbook pro santa rosa with an nvidia gfx card, 8600 GeForce I believe.
I'm attaching a screenshot of the error.
** Attachment added: Screenshot.png
http://launchpadlibrarian.net/13593293/Screenshot.png
--
Graphical
*** This bug is a duplicate of bug 216705 ***
https://bugs.launchpad.net/bugs/216705
** This bug has been marked a duplicate of bug 216705
0.7.4 release in Hardy introduced blurriness
--
Graphical glitches with latest compiz
https://bugs.launchpad.net/bugs/219873
You received this bug
** Attachment added: Screenshot
http://launchpadlibrarian.net/13586762/Schermata.png
--
Graphical glitches with latest compiz
https://bugs.launchpad.net/bugs/219873
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
--
ubuntu-bugs