Right.  Manually killing and restarting console-kit-daemon is sufficient
to trigger this problem.  I don't have complete information, but I still
believe this is a bug in PolicyKit as well as console-kit-daemon.

My educated guess is that when console-kit-daemon is restarted, it
forgets who's logged in.  The information IS available - because the "w"
command is quite capable of telling me who's logged in without running a
daemon.  So from my point of view that's a fairly damning bug in console
kit (because it suggests the authors ignored the existing login/logging
mechanism).

My understanding of PolicyKit is even more vague.  However, my
expectation is that system administration GUIs such as users-admin
should be as robust as possible.  I can't immediately think of a
realistic situation where this would be critical and you really don't
want to reboot to get PolicyKit working after console-kit-daemon has
crashed.  Nevertheless, the thought doesn't make me feel warm and fuzzy.

-- 
PolicyKit fails after restarting dbus (restarting all dbus services)
https://bugs.launchpad.net/bugs/231180
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