What happened to my root login?

I've been working for the last week of so setting up some custom mail services before going live with the server running SuSE 9.2. This evening I tried to log in as root in KDE, but when I did all I got was a YAST screen. Closing the YAST screen logs root out. What happened? I used to get a genuine KDE session that I could actually DO things in. Thanks Rob