Unable to start Totem after switching as root user.

Issue

• Trying to run totem from command line after switching as root user:

  $ su
  # totem  
  

• But totem is not starting from gnome-terminal. Getting following error message:

  (totem:xxxxx): WARNING **: Failed to connect to the session manager: None of the authentication protocols specified are supported
  (totem:xxxxx): Unique-DBus-WARNING **: Unable to open a connection to the session bus: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
  (totem:xxxxx): Unique-DBus-WARNING **: Unable to connect to the running instance, aborting.