This is a bug in democracy player. Dbus constructor is called with parameters in wrong order. Patch attached (I have already subnitted this to democracyplayer track system).
Index: platform/gtk-x11/onetime.py =================================================================== --- platform/gtk-x11/onetime.py (revision 4801) +++ platform/gtk-x11/onetime.py (working copy) @@ -109,7 +109,7 @@ def __init__(self): bus = dbus.SessionBus() bus_name = BusNameFlags('org.participatoryculture.dtv.onetime', bus=bus, flags=dbus.dbus_bindings.NAME_FLAG_DO_NOT_QUEUE) - dbus.service.Object.__init__(self, bus_name, '/org/participatoryculture/dtv/OneTime') + dbus.service.Object.__init__(self, bus_name=bus_name, object_path='/org/participatoryculture/dtv/OneTime') @dbus.service.method('org.participatoryculture.dtv.OneTimeIface') def HandleArgs (self, args):