Salva is right: the current report (go to "System Settings > Login Screen" resets some settings) is not a duplicate of bug #798091 (manually apply "Defaults" doesn't revert to real default settings).
Salva is right: the current report (go to "System Settings > Login Screen" resets some settings) is not a duplicate of bug #798091 (manually apply "Defaults" doesn't revert to real default settings).