Reported on the forum: http://forum.xfce.org/index.php?topic=3181.0 . Apparently the crash is in the treeview code when nothing has yet been selected. There is a warning from the treeview filter, but that's not where the crash occurs: (xfce4-panel:32744): Gtk-CRITICAL **: gtk_tree_model_filter_get_value: assertion `GTK_TREE_MODEL_FILTER (model)->priv->stamp == iter->stamp' failed (xfce4-panel:32744): GLib-GObject-WARNING **: gtype.c:3312: type id `0' is invalid (xfce4-panel:32744): GLib-GObject-WARNING **: can't peek value table for type `<invalid>' which is not currently referenced Segmentation fault Backtrace: (gdb) bt #0 0xb7ddd6c8 in gtk_tree_model_get_valist () from /usr/lib/libgtk-x11-2.0.so.0 #1 0xb7ddd8f6 in gtk_tree_model_get () from /usr/lib/libgtk-x11-2.0.so.0 #2 0x08057668 in cursor_changed (tv=0x80a3db0, pid=0x8090aa0) at panel-dialogs.c:212 #3 0xb7864cb8 in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0 #4 0xb784dddb in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0 #5 0xb7863678 in g_signal_has_handler_pending () from /usr/lib/libgobject-2.0.so.0 #6 0xb78645d4 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0 #7 0xb78648c6 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0 #8 0xb7dfcd48 in gtk_tree_view_scroll_to_cell () from /usr/lib/libgtk-x11-2.0.so.0 #9 0xb7e04142 in gtk_tree_view_set_cursor_on_cell () from /usr/lib/libgtk-x11-2.0.so.0 #10 0xb7e0426c in gtk_tree_view_set_cursor () from /usr/lib/libgtk-x11-2.0.so.0 #11 0x08058607 in add_items_dialog (panels=0x80a59a0, active_item=0x0) at panel-dialogs.c:492 #12 0x08051ed2 in panel_app_customize_items (active_item=0x0) at panel-app.c:793 #13 0xb7864cb8 in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0 ---Type <return> to continue, or q <return> to quit--- #14 0xb784dddb in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0 #15 0xb7863678 in g_signal_has_handler_pending () from /usr/lib/libgobject-2.0.so.0 #16 0xb78645d4 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0 #17 0xb78648c6 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0 #18 0xb7e19d6b in gtk_widget_activate () from /usr/lib/libgtk-x11-2.0.so.0 #19 0xb7d30dc2 in gtk_menu_shell_activate_item () from /usr/lib/libgtk-x11-2.0.so.0 #20 0xb7d31098 in gtk_menu_shell_activate_item () from /usr/lib/libgtk-x11-2.0.so.0 #21 0xb7d265b9 in gtk_menu_reorder_child () from /usr/lib/libgtk-x11-2.0.so.0 #22 0xb7d203f0 in gtk_marshal_VOID__UINT_STRING () from /usr/lib/libgtk-x11-2.0.so.0 #23 0xb784e119 in g_cclosure_new_swap () from /usr/lib/libgobject-2.0.so.0 #24 0xb784dddb in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0 #25 0xb78631eb in g_signal_has_handler_pending () from /usr/lib/libgobject-2.0.so.0 #26 0xb786431d in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0 #27 0xb78648c6 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0 #28 0xb7e19ef4 in gtk_widget_activate () from /usr/lib/libgtk-x11-2.0.so.0 #29 0xb7d1e857 in gtk_propagate_event () from /usr/lib/libgtk-x11-2.0.so.0 #30 0xb7d1eb8f in gtk_main_do_event () from /usr/lib/libgtk-x11-2.0.so.0 #31 0xb7ba5841 in gdk_event_get_graphics_expose () from /usr/lib/libgdk-x11-2.0.so.0 #32 0xb77db487 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0 #33 0xb77dce25 in g_main_context_acquire () from /usr/lib/libglib-2.0.so.0 #34 0xb77dd14a in g_main_loop_run () from /usr/lib/libglib-2.0.so.0 #35 0xb7d1de33 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0 #36 0x08051b8f in panel_app_run (argc=1, argv=0xbf95f1d4) at panel-app.c:735 #37 0x08051047 in main (argc=1, argv=0xbf95f1d4) at main.c:167 (gdb)
Fixed according to original reporter.