Hi, I had the same problem using the mot yet official KDE 3.4 packages. Reseting the kdm configuration by running this command fixed the problem for me:
genkdmconf --no-old Steffen -- Steffen Pingel - [EMAIL PROTECTED] - http://steffenpingel.de -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]