It's simple.
It happens when i deminimize firefox or thunderbird window (previously 
minimized).
I use "ati" open source driver, but it happens with "radeon" open source driver 
too.

P.S.: About black screen when I log in, wallpaper gets black not all
screen.

-- 
Enabling Desktop Effects, some part of firefox and thunderbird windows are 
black for few seconds when I deminimize them.
https://bugs.launchpad.net/bugs/113086
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