Restart in GNOME from System -> Shut Down doesn't work

[Muelli]

When I want to restart my machine, I click on System -> Shutdown and select Restart, but nothing visually happens. In fact, the machine doesn't restart at all.
I have to log out to get back to GDM and select Restart from the options menu in the bottom left.

I consider this a bug because I expected my machine to reboot in first place.

muelli@xbox:~$ apt-cache policy gnome-applets gnome-panel
gnome-applets:
  Installed: 2.23.4-0ubuntu1
  Candidate: 2.23.4-0ubuntu1
  Version table:
 *** 2.23.4-0ubuntu1 0
        500 http://de.archive.ubuntu.com intrepid/main Packages
        100 /var/lib/dpkg/status
     2.22.2-0ubuntu2 0
        500 http://de.archive.ubuntu.com hardy-updates/main Packages
     2.22.1-0ubuntu2 0
        450 http://de.archive.ubuntu.com hardy/main Packages
gnome-panel:
  Installed: 1:2.23.6-0ubuntu3
  Candidate: 1:2.23.6-0ubuntu3
  Version table:
 *** 1:2.23.6-0ubuntu3 0
        500 http://de.archive.ubuntu.com intrepid/main Packages
        100 /var/lib/dpkg/status
     1:2.22.2-0ubuntu1.1 0
        500 http://de.archive.ubuntu.com hardy-updates/main Packages
     1:2.22.1.2-0ubuntu3 0
        450 http://de.archive.ubuntu.com hardy/main Packages
muelli@xbox:~$