I will not be surprised to hear that you have an ati graphics card, using the radeon open source driver which seems to be a big problem at the moment, though worked very well in 9.04.
Have a look at:-
http://ubuntuforums.org/showthread.p...71#post8199471
http://ubuntuforums.org/showthread.php?t=1305306
http://ubuntuforums.org/showthread.php?t=1304961
and you may get some more help. As you say, you can stop using compiz, which is a shame, do a workaround with the driver which also has some other problems, or you can run in 16 bit colour, which appears to overcome the problem.
Let's hope this is sorted soon with an update.



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