I must say soory because this is not a bug. I've discovered that it was
a faliure of my graphics card and after I repaired my laptop i has not
more problems like this.
I'm going to put the bug to solved state ok?
** Changed in: xorg (Ubuntu)
Status: New => Invalid
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Buggy windows on ubuntu with and without desktop effects enabled
https://bugs.launchpad.net/bugs/419884
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