The screensaver won't activate properly. After the specified activation period, the screen will stop updating and if I move the mouse or press a key, the screen will refresh. It doesn't matter what screensaver I've selected.
I'm running KDE 3.3 (but the problem also happened under 3.2.3 and 3.2.2), XOrg 6.7.0. I've got an NVidia graphics card and the latest drivers.