restart and shutdown permissions

[Warren Block]

Despite having my user as a member of wheel and operator groups, and 
having this in 
/usr/local/etc/polkit-1/localauthority/50-local.d/org.freedesktop.consolekit.pkla:

   [Restart]
   Identity=unix-group:operator
   Action=org.freedesktop.consolekit.system.restart
   ResultAny=yes
   ResultInactive=yes
   ResultActive=yes

   [Shutdown]
   Identity=unix-group:operator
   Action=org.freedesktop.consolekit.system.stop
   ResultAny=yes
   ResultInactive=yes
   ResultActive=yes

The user still can't restart or shut down with the xfce buttons.  The X 
session ends, but that's it.  It's the same as logout.

>From a terminal window, the user can run shutdown -r now or shutdown -p 
now and it works.  Those buttons were not enabled until I installed 
sudo, but it may be some other permissions thing.  I didn't think sudo 
was required for this.

What is missing?