/usr/bin/rhythmbox:11:rb_source_can_pause:rb_shell_playing_changed_cb:g_closure_invoke:signal_emit_unlocked_R:g_signal_emit_valist

The Ubuntu Error Tracker has been receiving reports about a problem regarding rhythmbox. This problem was most recently seen with package version 3.4.1-1ubuntu1, the problem page at https://errors.ubuntu.com/problem/c81c0ff150b085c3935116af67a7576978d1fd81 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker you can request it at http://forms.canonical.com/reports/.