user switcher bug?

["David L" <idht4n gmail com>]

When I do the following:

Log on as user A
Switch to user B (start new session)
Switch to user A (return to existing session)
End user A's session (log out)
Return to user B's session
Switch to user A (ie, attempt to start a new session)

I get a blank screen.  From there I have to hit Alt-F1,
log in as root from the console, telinit 3 then telinit 5
to get back to the gdm login.  This is repeatable for
me (3 for 3).  User switcher bug, or buggy user?  ;)