I'm running OS 11.3x64, KDE 4.5.

After running updates yesterday (Friday) now the Shutdown and Log Off buttons don't work in KDE. This happens with the taskbar buttons, and in the Leave menu. The only way out now is to ALT+F1 into a console, log in as root, and run shutdown. The system will shutdown at that point, but it's pretty inconvenient. I'm using the login manager that installs with KDE (can't remember the name) since Gnome was installed as a secondary desktop.

I'm posting this using Gnome because it has not been affected by the problem so far. Thanks for any help.