yumex terminates

[don fisher]

I am running f16 with updates applied a couple of weeks ago. I tried to 
run yumex to see what ne packages might be available. I received the 
following:

/usr/lib/python2.7/site-packages/guihelpers/__init__.py:256: GtkWarning: 
gtk_scrolled_window_add(): cannot add non scrollable widget use 
gtk_scrolled_window_add_with_viewport() instead
   self.add_from_file(filename)
14:19:24 : DEBUG - network interface em1 (b44) is connected
14:19:34 : INFO - Connected to an network
14:19:34 : DEBUG - network interface em1 (b44) is connected
14:19:34 : INFO - Starting yum child process
14:19:37 : INFO - YUM: Error executing command as another user: Not 
authorized
14:20:03 : ERROR - ERROR: Fatal Error : backend-not-running
14:20:03 : ERROR - ERROR: backend not running as expected (yumex will close)
14:20:03 : INFO - yum backend process is ended
14:20:03 : INFO - yum backend process is ended
Program Terminated

I hope this is not me forgetting to do something obvious.

Don