This happens in Natty. For completeness this is the output from rhythmbox -d.

(16:06:52) [0x1c62040] [uevent_cb] rb-removable-media-manager.c:548: add event for /sys/devices/pci0000:00/0000:00:10.4/usb1/1-2 (bd06)
(16:06:52) [0x1c62040] [uevent_cb] rb-removable-media-manager.c:548: add event for /sys/devices/pci0000:00/0000:00:10.4/usb1/1-2/1-2:3.1 (0)
(16:06:52) [0x1c62040] [uevent_cb] rb-removable-media-manager.c:548: add event for /sys/devices/pci0000:00/0000:00:10.4/usb1/1-2/1-2:1.0 (0)
(16:06:52) [0x1c62040] [uevent_cb] rb-removable-media-manager.c:548: remove event for /sys/devices/pci0000:00/0000:00:10.4/usb1/1-2/1-2:1.0 (0)
(16:06:52) [0x1c62040] [uevent_cb] rb-removable-media-manager.c:548: add event for /sys/devices/pci0000:00/0000:00:10.4/usb1/1-2/1-2:3.0 (0)
(16:06:53) [0x1c62040] [dump_volume_identifiers] rb-removable-media-manager.c:621: uuid = 7313296eb2919dc9ac6ecd98cb80d90cf974f166
(16:06:53) [0x1c62040] [rb_removable_media_manager_add_volume] rb-removable-media-manager.c:666: Unhandled media
(16:06:55) [0x1c62040] [dump_volume_identifiers] rb-removable-media-manager.c:621: uuid = 7313296eb2919dc9ac6ecd98cb80d90cf974f166
(16:06:55) [0x1c62040] [rb_removable_media_manager_add_volume] rb-removable-media-manager.c:666: Unhandled media
(16:06:55) [0x1c62040] [rb_removable_media_manager_remove_volume] rb-removable-media-manager.c:679: volume removed
(16:06:55) [0x1c62040] [rb_removable_media_manager_remove_volume] rb-removable-media-manager.c:679: volume removed
(16:06:55) [0x1c62040] [rhythmdb_mount_added_cb] rhythmdb-monitor.c:430: volume afc://7313296eb2919dc9ac6ecd98cb80d90cf974f166/ mounted
(16:06:55) [0x1c62040] [rhythmdb_read_enter] rhythmdb.c:1239: counter: 1
(16:06:55) [0x1c62040] [rhythmdb_query_internal] rhythmdb.c:3997: doing query
(16:06:55) [0x1c62040] [do_query_recurse] rhythmdb-tree.c:2301: doing recursive query, 1 conjunctions
(16:06:55) [0x1c62040] [rhythmdb_query_internal] rhythmdb.c:4003: completed
(16:06:55) [0x1c62040] [rhythmdb_mount_added_cb] rhythmdb-monitor.c:444: 0 mounted entries to process
(16:06:55) [0x1c62040] [rb_removable_media_manager_add_mount] rb-removable-media-manager.c:708: Unhandled media, no volume for mount
(16:06:55) [0x1c62040] [rhythmdb_process_one_event] rhythmdb.c:2538: processing RHYTHMDB_EVENT_QUERY_COMPLETE
(16:06:55) [0x1c62040] [rhythmdb_read_leave] rhythmdb.c:1253: counter: 0
(16:06:56) [0x1c62040] [dump_volume_identifiers] rb-removable-media-manager.c:621: uuid = 7313296eb2919dc9ac6ecd98cb80d90cf974f166
(16:06:56) [0x1c62040] [rb_removable_media_manager_add_volume] rb-removable-media-manager.c:666: Unhandled media
(16:06:56) [0x1c62040] [rhythmdb_mount_added_cb] rhythmdb-monitor.c:430: volume afc://7313296eb2919dc9ac6ecd98cb80d90cf974f166/ mounted
(16:06:56) [0x1c62040] [rhythmdb_read_enter] rhythmdb.c:1239: counter: 1
(16:06:56) [0x1c62040] [rhythmdb_query_internal] rhythmdb.c:3997: doing query
(16:06:56) [0x1c62040] [do_query_recurse] rhythmdb-tree.c:2301: doing recursive query, 1 conjunctions
(16:06:56) [0x1c62040] [rhythmdb_query_internal] rhythmdb.c:4003: completed
(16:06:56) [0x1c62040] [rhythmdb_mount_added_cb] rhythmdb-monitor.c:444: 0 mounted entries to process
(16:06:56) [0x1c62040] [dump_volume_identifiers] rb-removable-media-manager.c:621: uuid = 7313296eb2919dc9ac6ecd98cb80d90cf974f166
no input path specified, can't find mount pointno input path specified, can't find device path
(16:06:56) [0x1c62040] [rb_plugin_find_file] rb-plugin.c:329: found '/usr/lib/rhythmbox/plugins/ipod/ipod-init.ui' when searching for file 'ipod-init.ui' for plugin 'ipod'
(16:06:56) [0x1c62040] [rb_removable_media_manager_add_mount] rb-removable-media-manager.c:742: Unhandled media
(16:06:56) [0x1c62040] [rhythmdb_process_one_event] rhythmdb.c:2538: processing RHYTHMDB_EVENT_QUERY_COMPLETE
(16:06:56) [0x1c62040] [rhythmdb_read_leave] rhythmdb.c:1253: counter: 0
(16:06:57) [0x1c62040] [rhythmdb_mount_added_cb] rhythmdb-monitor.c:430: volume afc://7313296eb2919dc9ac6ecd98cb80d90cf974f166:3/ mounted
(16:06:57) [0x1c62040] [rhythmdb_read_enter] rhythmdb.c:1239: counter: 1
(16:06:57) [0x1c62040] [rhythmdb_query_internal] rhythmdb.c:3997: doing query
(16:06:57) [0x1c62040] [do_query_recurse] rhythmdb-tree.c:2301: doing recursive query, 1 conjunctions
(16:06:57) [0x1c62040] [rhythmdb_query_internal] rhythmdb.c:4003: completed
(16:06:57) [0x1c62040] [rhythmdb_mount_added_cb] rhythmdb-monitor.c:444: 0 mounted entries to process
(16:06:57) [0x1c62040] [rb_removable_media_manager_add_mount] rb-removable-media-manager.c:708: Unhandled media, no volume for mount
(16:06:57) [0x1c62040] [rhythmdb_process_one_event] rhythmdb.c:2538: processing RHYTHMDB_EVENT_QUERY_COMPLETE
(16:06:57) [0x1c62040] [rhythmdb_read_leave] rhythmdb.c:1253: counter: 0
(16:06:57) [0x1c62040] [rb_uri_could_be_podcast] rb-file-helpers.c:601: 'afc://7313296eb2919dc9ac6ecd98cb80d90cf974f166/' can't be a Podcast or OPML file, not the right scheme
(16:06:57) [0x1c62040] [rb_shell_load_uri] rb-shell.c:3433: adding uri afc://7313296eb2919dc9ac6ecd98cb80d90cf974f166/, play 1
no input path specified, can't find mount point_get_mime_type_for_name for 'afc://7313296eb2919dc9ac6ecd98cb80d90cf974f166/' returned 'inode/directory'
(16:06:57) [0x1c62040] [load_uri_parser_finished_cb] rb-shell.c:3315: afc://7313296eb2919dc9ac6ecd98cb80d90cf974f166/ ignored
(16:06:57) [0x1c62040] [load_uri_parser_finished_cb] rb-shell.c:3366: couldn't find a source for afc://7313296eb2919dc9ac6ecd98cb80d90cf974f166/, trying to add it anyway
(16:06:57) [0x1c62040] [load_uri_parser_finished_cb] rb-shell.c:3368: couldn't do it: No registered source can handle URI afc://7313296eb2919dc9ac6ecd98cb80d90cf974f166/
(16:06:57) [0x1c62040] [load_uri_finish] rb-shell.c:3295: couldn't do anything
(16:06:57) [0x1c62040] [rb_shell_present] rb-shell.c:3634: presenting with timestamp 945730
(16:06:58) [0x1c62040] [dump_volume_identifiers] rb-removable-media-manager.c:621: uuid = 7313296eb2919dc9ac6ecd98cb80d90cf974f166
(16:06:58) [0x1c62040] [rb_removable_media_manager_add_volume] rb-removable-media-manager.c:666: Unhandled media
(16:06:58) [0x1c62040] [rhythmdb_mount_added_cb] rhythmdb-monitor.c:430: volume afc://7313296eb2919dc9ac6ecd98cb80d90cf974f166:3/ mounted
(16:06:58) [0x1c62040] [rhythmdb_read_enter] rhythmdb.c:1239: counter: 1
(16:06:58) [0x1c62040] [rhythmdb_query_internal] rhythmdb.c:3997: doing query
(16:06:58) [0x1c62040] [do_query_recurse] rhythmdb-tree.c:2301: doing recursive query, 1 conjunctions
(16:06:58) [0x1c62040] [rhythmdb_query_internal] rhythmdb.c:4003: completed
(16:06:58) [0x1c62040] [rhythmdb_mount_added_cb] rhythmdb-monitor.c:444: 0 mounted entries to process
(16:06:58) [0x1c62040] [dump_volume_identifiers] rb-removable-media-manager.c:621: uuid = 7313296eb2919dc9ac6ecd98cb80d90cf974f166
no input path specified, can't find device path
(16:06:58) [0x1c62040] [rb_plugin_find_file] rb-plugin.c:329: found '/usr/lib/rhythmbox/plugins/ipod/ipod-init.ui' when searching for file 'ipod-init.ui' for plugin 'ipod'
(16:06:58) [0x1c62040] [rb_removable_media_manager_add_mount] rb-removable-media-manager.c:742: Unhandled media
(16:06:58) [0x1c62040] [rhythmdb_process_one_event] rhythmdb.c:2538: processing RHYTHMDB_EVENT_QUERY_COMPLETE
(16:06:58) [0x1c62040] [rhythmdb_read_leave] rhythmdb.c:1253: counter: 0
(16:07:30) [0x1c62040] [rhythmdb_read_enter] rhythmdb.c:1239: counter: 1
(16:07:30) [0x1c62040] [rhythmdb_read_enter] rhythmdb.c:1239: counter: 2
(16:07:30) [0x1c62040] [rhythmdb_read_enter] rhythmdb.c:1239: counter: 3
(16:07:30) [0x1c62040] [rhythmdb_read_enter] rhythmdb.c:1239: counter: 4
(16:07:30) [0x3982d50] [query_thread_main] rhythmdb.c:4020: entering query thread
(16:07:30) [0x3982d50] [rhythmdb_query_internal] rhythmdb.c:3997: doing query
(16:07:30) [0x3982d50] [do_query_recurse] rhythmdb-tree.c:2301: doing recursive query, 1 conjunctions
(16:07:30) [0x3982d50] [rhythmdb_query_model_add_results] rhythmdb-query-model.c:2248: adding 0 entries
(16:07:30) [0x3982d50] [rhythmdb_query_internal] rhythmdb.c:4003: completed
(16:07:30) [0x3982d50] [query_thread_main] rhythmdb.c:4020: entering query thread
(16:07:30) [0x3982d50] [rhythmdb_query_internal] rhythmdb.c:3997: doing query
(16:07:30) [0x3982d50] [do_query_recurse] rhythmdb-tree.c:2301: doing recursive query, 1 conjunctions
(16:07:30) [0x3982d50] [rhythmdb_query_model_add_results] rhythmdb-query-model.c:2248: adding 0 entries
(16:07:30) [0x3982d50] [rhythmdb_query_internal] rhythmdb.c:4003: completed
(16:07:30) [0x3982d50] [query_thread_main] rhythmdb.c:4020: entering query thread
(16:07:30) [0x3982d50] [rhythmdb_query_internal] rhythmdb.c:3997: doing query
(16:07:30) [0x3982d50] [do_query_recurse] rhythmdb-tree.c:2301: doing recursive query, 1 conjunctions
(16:07:30) [0x3982d50] [rhythmdb_query_model_add_results] rhythmdb-query-model.c:2248: adding 0 entries
(16:07:30) [0x3982d50] [rhythmdb_query_internal] rhythmdb.c:4003: completed
(16:07:30) [0x3982d50] [query_thread_main] rhythmdb.c:4020: entering query thread
(16:07:30) [0x3982d50] [rhythmdb_query_internal] rhythmdb.c:3997: doing query
(16:07:30) [0x3982d50] [do_query_recurse] rhythmdb-tree.c:2301: doing recursive query, 1 conjunctions
(16:07:30) [0x3982d50] [rhythmdb_query_model_add_results] rhythmdb-query-model.c:2248: adding 0 entries
(16:07:30) [0x1c62040] [idle_process_update] rhythmdb-query-model.c:1187: inserting 0 rows
(16:07:30) [0x1c62040] [idle_process_update] rhythmdb-query-model.c:1187: inserting 0 rows
(16:07:30) [0x1c62040] [idle_process_update] rhythmdb-query-model.c:1187: inserting 0 rows
(16:07:30) [0x1c62040] [idle_process_update] rhythmdb-query-model.c:1187: inserting 0 rows
(16:07:30) [0x1c62040] [rhythmdb_process_one_event] rhythmdb.c:2538: processing RHYTHMDB_EVENT_QUERY_COMPLETE
(16:07:30) [0x1c62040] [rhythmdb_read_leave] rhythmdb.c:1253: counter: 3
(16:07:30) [0x1c62040] [rhythmdb_process_one_event] rhythmdb.c:2531: processing RHYTHMDB_EVENT_THREAD_EXITED
(16:07:30) [0x1c62040] [rhythmdb_process_one_event] rhythmdb.c:2538: processing RHYTHMDB_EVENT_QUERY_COMPLETE
(16:07:30) [0x1c62040] [rhythmdb_read_leave] rhythmdb.c:1253: counter: 2
(16:07:30) [0x1c62040] [rhythmdb_process_one_event] rhythmdb.c:2531: processing RHYTHMDB_EVENT_THREAD_EXITED
(16:07:30) [0x1c62040] [rhythmdb_process_one_event] rhythmdb.c:2538: processing RHYTHMDB_EVENT_QUERY_COMPLETE
(16:07:30) [0x1c62040] [rhythmdb_read_leave] rhythmdb.c:1253: counter: 1
(16:07:30) [0x1c62040] [rhythmdb_process_one_event] rhythmdb.c:2531: processing RHYTHMDB_EVENT_THREAD_EXITED
(16:07:30) [0x3982d50] [rhythmdb_query_internal] rhythmdb.c:4003: completed
(16:07:30) [0x1c62040] [rhythmdb_process_one_event] rhythmdb.c:2538: processing RHYTHMDB_EVENT_QUERY_COMPLETE
(16:07:30) [0x1c62040] [rhythmdb_read_leave] rhythmdb.c:1253: counter: 0
(16:07:30) [0x1c62040] [rhythmdb_process_one_event] rhythmdb.c:2531: processing RHYTHMDB_EVENT_THREAD_EXITED
(16:07:32) [0x1c62040] [rhythmdb_read_enter] rhythmdb.c:1239: counter: 1
(16:07:32) [0x1c62040] [rhythmdb_read_enter] rhythmdb.c:1239: counter: 2
(16:07:32) [0x3971a00] [query_thread_main] rhythmdb.c:4020: entering query thread
(16:07:32) [0x3971a00] [rhythmdb_query_internal] rhythmdb.c:3997: doing query
(16:07:32) [0x3971a00] [do_query_recurse] rhythmdb-tree.c:2301: doing recursive query, 1 conjunctions
(16:07:32) [0x3982d50] [query_thread_main] rhythmdb.c:4020: entering query thread
(16:07:32) [0x3982d50] [rhythmdb_query_internal] rhythmdb.c:3997: doing query
(16:07:32) [0x3982d50] [do_query_recurse] rhythmdb-tree.c:2301: doing recursive query, 1 conjunctions
(16:07:32) [0x3971a00] [rhythmdb_query_model_add_results] rhythmdb-query-model.c:2248: adding 0 entries
(16:07:32) [0x1c62040] [idle_process_update] rhythmdb-query-model.c:1187: inserting 0 rows
(16:07:32) [0x3971a00] [rhythmdb_query_internal] rhythmdb.c:4003: completed
(16:07:32) [0x1c62040] [rhythmdb_process_one_event] rhythmdb.c:2538: processing RHYTHMDB_EVENT_QUERY_COMPLETE
(16:07:32) [0x1c62040] [rhythmdb_read_leave] rhythmdb.c:1253: counter: 1
(16:07:32) [0x1c62040] [rhythmdb_process_one_event] rhythmdb.c:2531: processing RHYTHMDB_EVENT_THREAD_EXITED
(16:07:32) [0x3982d50] [rhythmdb_query_model_add_results] rhythmdb-query-model.c:2248: adding 0 entries
(16:07:32) [0x1c62040] [idle_process_update] rhythmdb-query-model.c:1187: inserting 0 rows
(16:07:32) [0x3982d50] [rhythmdb_query_internal] rhythmdb.c:4003: completed
(16:07:32) [0x1c62040] [rhythmdb_process_one_event] rhythmdb.c:2538: processing RHYTHMDB_EVENT_QUERY_COMPLETE
(16:07:32) [0x1c62040] [rhythmdb_read_leave] rhythmdb.c:1253: counter: 0
(16:07:32) [0x1c62040] [rhythmdb_process_one_event] rhythmdb.c:2531: processing RHYTHMDB_EVENT_THREAD_EXITED