Just hit this at the end of the rawhide update (right after the F9 unfreeze)

  Nettoyage : system-config-users          ##################### [453/453] 
ERROR:dbus.connection:Unable to set arguments () according to signature u's':
<type 'exceptions.TypeError'>: More items found in D-Bus signature than in
Python arguments
Traceback (most recent call last):
  File "/usr/bin/yum", line 29, in <module>
    yummain.user_main(sys.argv[1:], exit_code=True)
  File "/usr/share/yum-cli/yummain.py", line 241, in user_main
    errcode = main(args)
  File "/usr/share/yum-cli/yummain.py", line 193, in main
    base.doTransaction()
  File "/usr/share/yum-cli/cli.py", line 432, in doTransaction
    self.runTransaction(cb=cb)
  File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 790, in
runTransaction
    self.plugins.run('posttrans')
  File "/usr/lib/python2.5/site-packages/yum/plugins.py", line 175, in run
    func(conduitcls(self, self.base, conf, **kwargs))
  File "/usr/lib/yum-plugins/refresh-packagekit.py", line 37, in posttrans_hook
    packagekit_iface.StateHasChanged('posttrans')
  File "/usr/lib/python2.5/site-packages/dbus/proxies.py", line 68, in __call__
    return self._proxy_method(*args, **keywords)
  File "/usr/lib/python2.5/site-packages/dbus/proxies.py", line 140, in __call__
    **keywords)
  File "/usr/lib/python2.5/site-packages/dbus/connection.py", line 597, in
call_blocking
    message.append(signature=signature, *args)
TypeError: More items found in D-Bus signature than in Python arguments