Xvnc does not start KDE anymore after update to KDE 3.4

HI! Since updating my Suse 9.2 to KDE 3.4, Xvnc (started via xinetd) does not start KDE anymore. When I connect to the specified port, I get a grey screen and an X mouse pointer, but no KDE login. I get nothing in .xsession-errors (I guess because Xvnc is being started by user nobody) and nothing in /var/log/messages. vncserver works OK. Any hints? Thanks! Thomas