Comment 2 for bug 67803

I've changed to "C" and problem persists in System/administration menu
Options unavailable:
networkmanager (Networking)
services
shared folders
Date and time
Users and groups

Options that ask user passwords as expected:
firestarter
gparted
gnome-language-selector
gdmsetup
synaptic

Message box:
+==============+
The Configuration Could not be loaded
You are not allowed to access system configuration
+==============+

gksudo in command line works
$ gksudo date
Mon Oct 23 21:43:51 VET 2006