YAST problem

I've got problem running yast, which I believe it happens after I upgrade some packages (not sure which). If I run yast from kicker, after giving the root password, I got an error windows, saying: "Command '/sbin/yast2' not found" If I run yast2 from a console/terminal, I got the following message: /usr/lib/YaST2/bin/y2controlcenter: error while loading shared libraries: /opt/kde3/lib/libkdefx.so.4: undefined symbol: _ZN10DCOPClientC1Ev Searching in google, I got the following related thread: http://www.netsys.com/suse-linux-e/2001/07/msg01706.html but there is no followup. Anybody knows what's happening and how to solve it? flubie -- Rules: (1) The boss is always right. (2) When the boss is wrong, refer to rule 1.