My system has acquired an odd bug: as a normal user of "December" with Razor-QT, I cannot shutdown or reboot using selections from the menu. A D-bus error is thrown back, saying that the action is denied.
I can, however, issue a sudo poweroff or sudo reboot command. It appears that my permissions for normal users are mangled, as even newly created users have the same problem. I've tried removing and reinstalling razor-qt, policykit, and systemd and have the same system behavior happening.
Another possible side effect of this problem is behavior of Qtfm. I cannot click to open files in LibreOffice, VLC, and other applications. Editing the mime types / default apps has no effect.
Can someone suggest another action to repair the system?