*** This bug is a duplicate of bug 546578 ***
    https://bugs.launchpad.net/bugs/546578

I was having a similar problem, except my screen would display all sorts
of colors mashed together.  I disabled visual effects by changing the
setting from normal to none in the appearance menu and this appears to
have resolved the issue.

-- 
black screen when switching between multiple X session
https://bugs.launchpad.net/bugs/529882
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