knetworkmanager no connecting on one particular wlan

Hi here’s an odd one:
on kde4 with knetworkmanager I cannot get past the wep security key on my home router. Every other wlan works, ethernet works, settings are definitely correct because it works with windows, other computers.And on the same computer even with gnome networkmanager! Also it used to work fine earlier. Behavior the same with different users including root, regardless of using kwallet or not. Networkamanager tries to connect and after one or two minutes throws the setting window back at me. I uninstalled and re-installed and deleted all related files I could think of. I even tried a complete fresh installation of opensuse only keeping the /home partition, so the problem must be lying there I guess. But then why all users?
puzzled.
alex

PS opensuse 11.2
kde networkmanager 0.9.svn1043876-1.1.1

tried versions 1.3.1 and 3.1 as well with no difference.