Caffeine plus doesn't work correctly for me either.
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https://bugs.launchpad.net/bugs/1388759
Title:
powersaving/screensaver UnInhibit method times out over DBus
To manage notifications
Same here on Utupic. Interestingly enough calling inhibit seems to be
working just fine, only uninhibiting is buggy.
As a result programs like caffeine don't work any more as well.
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: unity-settings-daemon (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/138875