Switch User still broken

[pocallaghan at gmail.com (Patrick O'Callaghan)]

KDE 4.3.4, F12.

IIRC the "Switch User" function hasn't worked for me in any version of
KDE 4. I just get a blank pop-pup window with nothing to select except
the "Close" widget.

Is this a known problem or is it yet another consequence of incompatible
config files between versions?

poc