I had a similar bug: switching to a new user display a black screen with
only the mouse cursor.

I can switch to the text consoles (Ctrl-Alt-Fn) and to the first X
session. But it looks like the second X is "mixed" with the first one. I
can see the user selector a few milliseconds before the first X session
is displayed if I switch to F8. And I have the black screen with mouse
cursor on F9.

My Lucid 10.04.1 system is an upgrade from 8.04. It looks like the use 
switching applet is the source of the problem (in my case).
Removing  ~/.gnome* and ~/.gconf* to reinitialization the gnome configuration 
solved the problem.

The old (and problematic) user switching applet was the one with the
green running man. The new (and working) user switching applet has a
power sign as icon.

-- 
black screen after a few user switches
https://bugs.launchpad.net/bugs/546578
You received this bug notification because you are a member of Ubuntu-X,
which is the registrant for xserver-xorg-driver-ati.

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