Ubuntu natty with xbmc dharma won't shut down from menu

Solved this by editing /var/lib/polkit-1/localauthority/50-local.d/custom-actions.pkla

and replacing it with the following. Just make sure "xbmc", marked red, is the correct user...

[Actions for xbmc user]
Identity=unix-user:xbmc
Action=org.freedesktop.upower.*;org.freedesktop.consolekit.system.*;org.freedesktop.udisks.*
ResultAny=yes
ResultInactive=no
ResultActive=yes

Thanks to
http://wiki.xbmc.org/index.php?title=Ubuntu_Suspend_/_Wake