Regarding Matthieu Baerts' summary, I can confirm that removing the logout applet from Cairo-dock solves the problem. I have 14.04 running on two partitions: one stable and the other with Proposed enabled and after removing the applet and rebooting both can reboot/shutdown/suspend from the Unity menu.
Regarding Matthieu Baerts' summary, I can confirm that removing the logout applet from Cairo-dock solves the problem. I have 14.04 running on two partitions: one stable and the other with Proposed enabled and after removing the applet and rebooting both can reboot/ shutdown/ suspend from the Unity menu.