When I opened Rhythmbox Player it looked ok for about half a second before crashing. I tried opening it from a terminal with the same result. Here is the info that showed up in the terminal.
(rhythmbox:2035): Rhythmbox-WARNING **: Unable to grab media player keys: GDBus.Errorrg.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SettingsDaemon was not provided by any .service files
WARNING: gnome-keyring:: couldn't connect to: /tmp/keyring-GfA8yQ/pkcs11: No such file or directory
Does this help? Any other info needed?