KDEsu problems

Hi to everyone. I am having SuSE 8.2 (KDE 3.1.1) , Qt 3.1.1, Greek locale. When i execute Yast2 via the KDE menu, KDEsu asks me for the ROOT passwd. That is fine. I check the 'Remember password' checkbox so that KDE remembers the root pass during the session. But when i close Yast2 and i re-run it, KDEsu still asks for the root password... Do u encounter the same problem under KDE 3.1.1 ? Can u reproduce it? I have tried to upgrade to KDE 3.1.2 with QT-3.2.0beta(or qt3.1.2) but the problem still persists. Any ideas? Thanks.