I don't know if this is related, but running rb in debugger causes this:

(15:22:15) [0x8050e68] [construct_sources] rb-shell.c:1450: shell: creating 
playlist manager
(15:22:15) [0x8050e68] [construct_sources] rb-shell.c:1464: shell: creating 
removable media manager
(15:22:15) [0x8050e68] [construct_load_ui] rb-shell.c:1485: shell: loading ui
(15:22:15) [0x834cfb0] [query_thread_main] rhythmdb.c:4020: entering query 
thread
(15:22:15) [0x834cfb0] [rhythmdb_query_internal] rhythmdb.c:3997: doing query
(15:22:15) [0x834cfb0] [do_query_recurse] rhythmdb-tree.c:2301: doing recursive 
query, 1 conjunctions
(15:22:15) [0x834cfb0] [rhythmdb_query_model_add_results] 
rhythmdb-query-model.c:2248: adding 0 entries
(15:22:15) [0x834cfb0] [rhythmdb_query_internal] rhythmdb.c:4003: completed
(15:22:15) [0x8050e68] [rb_shell_select_source] rb-shell.c:2201: selecting 
source 0x832e0b8
(15:22:15) [0x8050e68] [rb_shell_clipboard_set_source_internal] 
rb-shell-clipboard.c:354: selected source 0x832e0b8
(15:22:15) [0x8050e68] [rb_shell_clipboard_sync] rb-shell-clipboard.c:600: 
syncing clipboard
(15:22:15) [0x8050e68] [rebuild_playlist_menu] rb-shell-clipboard.c:1036: 
rebuilding add-to-playlist menu

(rhythmbox:16261): GLib-GObject-CRITICAL **: g_object_unref: assertion
`G_IS_OBJECT (object)' failed

Program received signal SIGINT, Interrupt.
0xb7fe2832 in ?? () from /lib/ld-linux.so.2
(gdb) bt
#0  0xb7fe2832 in ?? () from /lib/ld-linux.so.2
#1  0xb73a4990 in raise () from /lib/libpthread.so.0
#2  0xb7f6b599 in rb_debug_stop_in_debugger () at rb-debug.c:255
#3  0xb7f6b601 in log_handler (domain=0xb7389ecc "GLib-GObject", 
level=G_LOG_LEVEL_CRITICAL, 
    message=0x83a6348 "g_object_unref: assertion `G_IS_OBJECT (object)' 
failed", data=0x0) at rb-debug.c:272
#4  0xb72be0eb in g_logv () from /lib/libglib-2.0.so.0
#5  0xb72be572 in g_log () from /lib/libglib-2.0.so.0
#6  0xb72be79d in g_return_if_fail_warning () from /lib/libglib-2.0.so.0
#7  0xb73614e2 in g_object_unref () from /usr/lib/libgobject-2.0.so.0
#8  0xb7edc614 in add_playlist_to_menu (model=0x820b438, path=0x825c0a8, 
iter=0xbfffee30, clipboard=0x81f49b0) at rb-shell-clipboard.c:982
#9  0xb7c8b4e0 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#10 0xb7c8b521 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#11 0xb7c8bccb in gtk_tree_model_foreach () from /usr/lib/libgtk-x11-2.0.so.0
#12 0xb7edbe9b in rebuild_playlist_menu (clipboard=0x820b438) at 
rb-shell-clipboard.c:1056
#13 0xb7edc203 in rb_shell_clipboard_set_property (object=0x81f49b0, prop_id=1, 
value=0xbffff008, pspec=0x8204990) at rb-shell-clipboard.c:453
#14 0xb736595a in g_object_set_valist () from /usr/lib/libgobject-2.0.so.0
#15 0xb7366076 in g_object_set () from /usr/lib/libgobject-2.0.so.0
#16 0xb7edabb6 in rb_shell_clipboard_set_source (clipboard=0x81f49b0, 
source=0x832e0b8) at rb-shell-clipboard.c:532
#17 0xb7ed2510 in rb_shell_select_source (shell=0x8209010, source=0x832e0b8) at 
rb-shell.c:2225
#18 0xb7ed9ba8 in rb_shell_constructed (object=0x8209010) at rb-shell.c:1633
#19 0xb7364a2c in g_object_newv () from /usr/lib/libgobject-2.0.so.0
#20 0xb73653cc in g_object_new_valist () from /usr/lib/libgobject-2.0.so.0
#21 0xb73654e7 in g_object_new () from /usr/lib/libgobject-2.0.so.0
#22 0xb7ed510d in rb_shell_new (no_registration=0, no_update=0, dry_run=0, 
autostarted=0, rhythmdb=0x0, playlists=0x0) at rb-shell.c:1180
#23 0x0804b069 in main (argc=1, argv=0xbffff484) at main.c:276

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https://bugs.launchpad.net/bugs/672089

Title:
  GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT
  (object)' failed

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