https://bugs.freedesktop.org/show_bug.cgi?id=29951
--- Comment #10 from pmarques@grupopie.com 2011-09-23 04:10:57 PDT --- Doesn't this seem to be some sort of race condition?
The screensaver needs to do a "screenshot" to display on the floor. If it captures the screenshot too late, it gets its own image instead of the desktop image...