I have exactly the same problem anytime I Alt+Return to edit a song's metadata (mainly .mp3)

Rhythmbox 12
GStreamer

Message Error while saving song information
Internal GStremer problem, file a bug

rhythmbox -d

(rhythmbox-metadata:4505): GStreamer-CRITICAL **: gst_tag_get_type: assertion `info != NULL' failed

(rhythmbox-metadata:4505): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.20.1/gobject/gtype.c:3940: type id `0' is invalid

(rhythmbox-metadata:4505): GLib-GObject-WARNING **: can't peek value table for type `<invalid>' which is not currently referenced

(rhythmbox-metadata:4505): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.20.1/gobject/gvalue.c:192: cannot initialize GValue with type `(null)', this type has no GTypeValueTable implementation

(rhythmbox-metadata:4505): GLib-GObject-CRITICAL **: g_value_transform: assertion `G_IS_VALUE (dest_value)' failed

(rhythmbox-metadata:4505): GLib-GObject-CRITICAL **: g_value_unset: assertion `G_IS_VALUE (value)' failed

(rhythmbox-metadata:4505): GStreamer-CRITICAL **: gst_tag_get_type: assertion `info != NULL' failed

(rhythmbox-metadata:4505): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.20.1/gobject/gtype.c:3940: type id `0' is invalid

(rhythmbox-metadata:4505): GLib-GObject-WARNING **: can't peek value table for type `<invalid>' which is not currently referenced

(rhythmbox-metadata:4505): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.20.1/gobject/gvalue.c:192: cannot initialize GValue with type `(null)', this type has no GTypeValueTable implementation

(rhythmbox-metadata:4505): GLib-GObject-CRITICAL **: g_value_transform: assertion `G_IS_VALUE (dest_value)' failed

(rhythmbox-metadata:4505): GLib-GObject-CRITICAL **: g_value_unset: assertion `G_IS_VALUE (value)' failed

(rhythmbox-metadata:4505): GStreamer-CRITICAL **: gst_tag_get_type: assertion `info != NULL' failed

(rhythmbox-metadata:4505): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.20.1/gobject/gtype.c:3940: type id `0' is invalid

(rhythmbox-metadata:4505): GLib-GObject-WARNING **: can't peek value table for type `<invalid>' which is not currently referenced

(rhythmbox-metadata:4505): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.20.1/gobject/gvalue.c:192: cannot initialize GValue with type `(null)', this type has no GTypeValueTable implementation

(rhythmbox-metadata:4505): GLib-GObject-CRITICAL **: g_value_transform: assertion `G_IS_VALUE (dest_value)' failed

(rhythmbox-metadata:4505): GLib-GObject-CRITICAL **: g_value_unset: assertion `G_IS_VALUE (value)' failed

(rhythmbox-metadata:4505): GStreamer-CRITICAL **: gst_tag_get_type: assertion `info != NULL' failed

(rhythmbox-metadata:4505): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.20.1/gobject/gtype.c:3940: type id `0' is invalid

(rhythmbox-metadata:4505): GLib-GObject-WARNING **: can't peek value table for type `<invalid>' which is not currently referenced

(rhythmbox-metadata:4505): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.20.1/gobject/gvalue.c:192: cannot initialize GValue with type `(null)', this type has no GTypeValueTable implementation

(rhythmbox-metadata:4505): GLib-GObject-CRITICAL **: g_value_transform: assertion `G_IS_VALUE (dest_value)' failed

(rhythmbox-metadata:4505): GLib-GObject-CRITICAL **: g_value_unset: assertion `G_IS_VALUE (value)' failed
(09:53:59) [0x8a1bc60] [rb_metadata_gst_add_tag_data] rb-metadata-gst.c:1254: Setting musicbrainz-sortname
(09:53:59) [0x8a1bc60] [rb_add_id3_tagger] rb-metadata-gst.c:210: using id3v2mux
(09:53:59) [0x8a1bc60] [id3_pad_added_cb] rb-metadata-gst.c:167: linked pad from id3de to id3mux
(09:53:59) [0x8a1bc60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from giostreamsink
(09:53:59) [0x8a1bc60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from id3v2mux0
(09:53:59) [0x8a1bc60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from id3demux0
(09:53:59) [0x8a1bc60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from urisrc
(09:53:59) [0x8a1bc60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from pipeline
(09:53:59) [0x8a1bc60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from id3v2mux0
(09:53:59) [0x8a1bc60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from id3demux0
(09:53:59) [0x8a1bc60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type stream-status from src
(09:53:59) [0x8a1bc60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type stream-status from src
(09:53:59) [0x8a1bc60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from giostreamsink
(09:53:59) [0x8a1bc60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from urisrc
(09:53:59) [0x8a1bc60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from pipeline
(09:53:59) [0x8a1bc60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type async-done from pipeline
(09:53:59) [0x8a1bc60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type new-clock from pipeline
(09:53:59) [0x8a1bc60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from giostreamsink
(09:53:59) [0x8a1bc60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from id3v2mux0
(09:53:59) [0x8a1bc60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from id3demux0
(09:53:59) [0x8a1bc60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from urisrc
(09:53:59) [0x8a1bc60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from pipeline
(09:54:02) [0x958b408] [rb_audioscrobbler_should_handshake] rb-audioscrobbler.c:819: No username set
(09:54:05) [0x958b408] [rhythmdb_read_enter] rhythmdb.c:1176: counter: 1
(09:54:05) [0xa01ae18] [query_thread_main] rhythmdb.c:3975: entering query thread
(09:54:05) [0xa01ae18] [rhythmdb_query_internal] rhythmdb.c:3952: doing query
(09:54:05) [0xa01ae18] [do_query_recurse] rhythmdb-tree.c:2240: doing recursive query, 1 conjunctions
(09:54:05) [0xa01ae18] [rhythmdb_query_model_add_results] rhythmdb-query-model.c:2023: adding 6 entries
(09:54:05) [0xa01ae18] [rhythmdb_query_internal] rhythmdb.c:3958: completed
(09:54:05) [0x958b408] [rhythmdb_read_enter] rhythmdb.c:1176: counter: 2
(09:54:05) [0xa01ae18] [query_thread_main] rhythmdb.c:3975: entering query thread
(09:54:05) [0xa01ae18] [rhythmdb_query_internal] rhythmdb.c:3952: doing query
(09:54:05) [0xa01ae18] [do_query_recurse] rhythmdb-tree.c:2240: doing recursive query, 1 conjunctions
(09:54:05) [0xa01ae18] [rhythmdb_query_model_add_results] rhythmdb-query-model.c:2023: adding 0 entries
(09:54:05) [0xa01ae18] [rhythmdb_query_internal] rhythmdb.c:3958: completed
(09:54:05) [0x958b408] [idle_process_update] rhythmdb-query-model.c:1065: inserting 6 rows
(09:54:05) [0x958b408] [idle_process_update] rhythmdb-query-model.c:1065: inserting 0 rows
(09:54:05) [0x958b408] [rhythmdb_process_one_event] rhythmdb.c:2515: processing RHYTHMDB_EVENT_QUERY_COMPLETE
(09:54:05) [0x958b408] [rhythmdb_read_leave] rhythmdb.c:1190: counter: 1
(09:54:05) [0x958b408] [rhythmdb_process_one_event] rhythmdb.c:2508: processing RHYTHMDB_EVENT_THREAD_EXITED
(09:54:05) [0x958b408] [rhythmdb_process_one_event] rhythmdb.c:2515: processing RHYTHMDB_EVENT_QUERY_COMPLETE
(09:54:05) [0x958b408] [rhythmdb_read_leave] rhythmdb.c:1190: counter: 0
(09:54:05) [0x958b408] [rhythmdb_process_one_event] rhythmdb.c:2508: processing RHYTHMDB_EVENT_THREAD_EXITED
(09:54:14) [0x9f30370] [kill_metadata_service] rb-metadata-dbus-client.c:147: closing dbus connection
(09:54:16) [0x9f30370] [kill_metadata_service] rb-metadata-dbus-client.c:157: killing child process
(09:54:16) [0x9f30370] [kill_metadata_service] rb-metadata-dbus-client.c:164: closing metadata child process stdout pipe
(09:54:16) [0x9f30370] [default_sync_metadata] rhythmdb.c:4525: error saving metadata for file:///home/mtpc03/Music/Conversions/Conversions_030_April_Adi_Dumitra_Part1.mp3: Internal GStreamer problem; file a bug; reloading metadata to revert
(09:54:16) [0x9f30370] [action_thread_main] rhythmdb.c:2891: executing RHYTHMDB_ACTION_LOAD for "file:///home/mtpc03/Music/Conversions/Conversions_030_April_Adi_Dumitra_Part1.mp3"
(09:54:18) [0x958b408] [rb_audioscrobbler_should_handshake] rb-audioscrobbler.c:819: No username set
(09:54:20) [0x9725c60] [rb_debug_init_match] rb-debug.c:215: Debugging enabled
(09:54:20) [0x9725c60] [main] rb-metadata-dbus-service.c:527: initializing metadata service; pid = 4512; address = unix:tmpdir=/tmp
(09:54:20) [0x9725c60] [main] rb-metadata-dbus-service.c:546: D-BUS server listening on address unix:abstract=/tmp/dbus-tpKVy50Y1d,guid=6f761780e5a4531c4661cabf4a8c9ebc
(09:54:20) [0x9f30370] [start_metadata_service] rb-metadata-dbus-client.c:290: Got metadata helper D-BUS address unix:abstract=/tmp/dbus-tpKVy50Y1d,guid=6f761780e5a4531c4661cabf4a8c9ebc
(09:54:20) [0x9f30370] [start_metadata_service] rb-metadata-dbus-client.c:306: Metadata process 4512 started
(09:54:20) [0x9f30370] [rb_metadata_load] rb-metadata-dbus-client.c:413: sending metadata load request
(09:54:20) [0x9725c60] [_new_connection] rb-metadata-dbus-service.c:397: new connection to metadata service
(09:54:20) [0x9725c60] [_handle_message] rb-metadata-dbus-service.c:369: handling metadata service message
(09:54:20) [0x9725c60] [rb_metadata_dbus_load] rb-metadata-dbus-service.c:144: loading metadata from file:///home/mtpc03/Music/Conversions/Conversions_030_April_Adi_Dumitra_Part1.mp3
(09:54:20) [0x9725c60] [rb_metadata_load] rb-metadata-gst.c:1018: loading metadata for uri: file:///home/mtpc03/Music/Conversions/Conversions_030_April_Adi_Dumitra_Part1.mp3
(09:54:20) [0x9725c60] [rb_metadata_load] rb-metadata-gst.c:1073: going to PAUSED for metadata, uri: file:///home/mtpc03/Music/Conversions/Conversions_030_April_Adi_Dumitra_Part1.mp3
(09:54:20) [0x9725c60] [rb_metadata_gst_typefind_cb] rb-metadata-gst.c:765: found type audio/mpeg
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from fakesink
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from fakesink
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from typefind
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from decodebin
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from urisrc
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from pipeline
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from mpegaudioparse0
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from mpegaudioparse0
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from typefind
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type stream-status from src
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type stream-status from src
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from urisrc
(09:54:20) [0x97e1b90] [rb_metadata_gst_new_decoded_pad_cb] rb-metadata-gst.c:797: got decoded audio pad of type audio/x-raw-int
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from mad0
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from mad0
(09:54:20) [0x9725c60] [rb_metadata_gst_load_tag] rb-metadata-gst.c:663: uri: file:///home/mtpc03/Music/Conversions/Conversions_030_April_Adi_Dumitra_Part1.mp3 tag: audio-codec 
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type duration from mpegaudioparse0
(09:54:20) [0x9725c60] [rb_metadata_gst_load_tag] rb-metadata-gst.c:663: uri: file:///home/mtpc03/Music/Conversions/Conversions_030_April_Adi_Dumitra_Part1.mp3 tag: bitrate 
(09:54:20) [0x9725c60] [rb_metadata_gst_load_tag] rb-metadata-gst.c:663: uri: file:///home/mtpc03/Music/Conversions/Conversions_030_April_Adi_Dumitra_Part1.mp3 tag: has-crc 
(09:54:20) [0x9725c60] [rb_metadata_gst_load_tag] rb-metadata-gst.c:663: uri: file:///home/mtpc03/Music/Conversions/Conversions_030_April_Adi_Dumitra_Part1.mp3 tag: channel-mode 
(09:54:20) [0x9725c60] [rb_metadata_gst_load_tag] rb-metadata-gst.c:663: uri: file:///home/mtpc03/Music/Conversions/Conversions_030_April_Adi_Dumitra_Part1.mp3 tag: layer 
(09:54:20) [0x9725c60] [rb_metadata_gst_load_tag] rb-metadata-gst.c:663: uri: file:///home/mtpc03/Music/Conversions/Conversions_030_April_Adi_Dumitra_Part1.mp3 tag: mode 
(09:54:20) [0x9725c60] [rb_metadata_gst_load_tag] rb-metadata-gst.c:663: uri: file:///home/mtpc03/Music/Conversions/Conversions_030_April_Adi_Dumitra_Part1.mp3 tag: emphasis 
(09:54:20) [0x9725c60] [rb_metadata_gst_load_tag] rb-metadata-gst.c:663: uri: file:///home/mtpc03/Music/Conversions/Conversions_030_April_Adi_Dumitra_Part1.mp3 tag: bitrate 
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from fakesink
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from decodebin
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from fakesink
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from fakesink
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from fakesink
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type state-changed from pipeline
(09:54:20) [0x9725c60] [rb_metadata_bus_handler] rb-metadata-gst.c:946: message of type async-done from pipeline
(09:54:20) [0x9725c60] [rb_metadata_load] rb-metadata-gst.c:1105: gone to PAUSED for file:///home/mtpc03/Music/Conversions/Conversions_030_April_Adi_Dumitra_Part1.mp3
(09:54:20) [0x9725c60] [rb_metadata_load] rb-metadata-gst.c:1122: duration query succeeded
(09:54:20) [0x9725c60] [rb_metadata_load] rb-metadata-gst.c:1210: successfully read metadata for file:///home/mtpc03/Music/Conversions/Conversions_030_April_Adi_Dumitra_Part1.mp3
(09:54:20) [0x9725c60] [rb_metadata_dbus_load] rb-metadata-dbus-service.c:162: metadata load finished; mimetype = audio/mpeg
(09:54:20) [0x9725c60] [rb_metadata_dbus_add_to_message] rb-metadata-dbus.c:132: opening container type {uv}
(09:54:20) [0x9f30370] [rb_metadata_load] rb-metadata-dbus-client.c:481: got mimetype: audio/mpeg
(09:54:20) [0x958b408] [rhythmdb_process_one_event] rhythmdb.c:2486: processing RHYTHMDB_EVENT_METADATA_LOAD
(09:54:26) [0x958b408] [window_focus_cb] rb-mmkeys-plugin.c:142: window got focus, re-grabbing media keys