Update: If I, as APREA Thomas says, enable Power Manager as a Startup
Program under System->Preferences->Sessions the hang does not happen.
And all four buttons (Restart, Shutdown, Suspend and Hibernate) appear
at the bottom of the "shut down dialog".

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Quit button freezes screen but does not present Log out etc. options dialog
https://bugs.launchpad.net/bugs/150846
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