I had the same bug in Mate 17.10 and Mate 18.04. Removing the paket rhythmbox-plugin-alternative-toolbar fixed it for me.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to rhythmbox in Ubuntu. https://bugs.launchpad.net/bugs/1689927 Title: Rhythmbox crashes after starting it (Ubuntu MATE 17.04) Status in rhythmbox package in Ubuntu: Invalid Bug description: After starting Rhythmbox the first time after fresh installing Ubuntu MATE 17.04, Rhythmbox searches for new files. The next time i start it, Rhythmbox crashes after less than 5 seconds. Rhythmbox is not usable anymore. You can see the attached screenshot for more details. EDIT 13.05.2017: When i start Rhythmbox i a terminal, this is the result: ****************************************************************************** (rhythmbox:5566): Gtk-CRITICAL **: gtk_box_pack: assertion '_gtk_widget_get_parent (child) == NULL' failed (rhythmbox:5566): Gtk-WARNING **: actionhelper: action app.play-repeat can't be activated due to parameter type mismatch (parameter type NULL, target type b) (rhythmbox:5566): Gtk-WARNING **: actionhelper: action app.play- shuffle can't be activated due to parameter type mismatch (parameter type NULL, target type b) (rhythmbox:5566): Rhythmbox-WARNING **: Unable to grab media player keys: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SettingsDaemon was not provided by any .service files (rhythmbox:5566): Gtk-WARNING **: Allocating size to GtkButton 0x5620febf7c00 without calling gtk_widget_get_preferred_width/height(). How does the code know the size to allocate? (rhythmbox:5566): Gtk-WARNING **: Allocating size to GtkButton 0x5620fec6f880 without calling gtk_widget_get_preferred_width/height(). How does the code know the size to allocate? (rhythmbox:5566): Gtk-CRITICAL **: gtk_tree_view_update_button_position: assertion 'column_el != NULL' failed Speicherzugriffsfehler (Speicherabzug geschrieben) ****************************************************************************** To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rhythmbox/+bug/1689927/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp