Comment 2 for bug 93750

Same issue with gnomebaker - able to burn iso as root with the following output in terminal:

mark@PeaceSea:~$ sudo gnomebaker
(process:5791): GStreamer-WARNING **: The GStreamer function gst_init_get_option_group() was
        called, but the GLib threading system has not been initialised
        yet, something that must happen before any other GLib function
        is called. The application needs to be fixed so that it calls
           if (!g_thread_supported ()) g_thread_init(NULL);
        as very first thing in its main() function. Please file a bug
        against this application.
libnotify-Message: Unable to get 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.

and after burning complete the following:
** (gnomebaker:5791): CRITICAL **: dbus_g_proxy_connect_signal: assertion `DBUS_IS_G_PROXY (proxy)' failed