Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1024 (LWP 24786)]
0x408eafe3 in g_type_check_instance_cast (type_instance=0x4, iface_type=135044728)
    at gtype.c:2638
2638	      if (type_instance->g_class)
(gdb) bt
#0  0x408eafe3 in g_type_check_instance_cast (type_instance=0x4, iface_type=135044728)
    at gtype.c:2638
#1  0x403cdd8d in gtk_message_dialog_style_set (widget=0x80df0c0, prev_style=0x80df258)
    at gtkmessagedialog.c:407
#2  0x408e3dc0 in g_cclosure_marshal_VOID__OBJECT (closure=0x80ce110, return_value=0x0,     n_param_values=2, param_values=0xbfffed00, invocation_hint=0xbfffec08, 
    marshal_data=0x403cdd40) at gmarshal.c:636
#3  0x408cf203 in g_type_class_meta_marshal (closure=0x80ce110, return_value=0x0, 
    n_param_values=2, param_values=0xbfffed00, invocation_hint=0xbfffec08, 
    marshal_data=0x90) at gclosure.c:514
#4  0x408cee0a in g_closure_invoke (closure=0x80ce110, return_value=0x0, 
    n_param_values=2, param_values=0xbfffed00, invocation_hint=0xbfffec08)
    at gclosure.c:437
#5  0x408e2044 in signal_emit_unlocked_R (node=0x80ce148, detail=0, instance=0x80df0c0,     emission_return=0x0, instance_and_params=0xbfffed00) at gsignal.c:2271
#6  0x408e0dce in g_signal_emit_valist (instance=0x80df0c0, signal_id=23, detail=0, 
    var_args=0xbfffee8c) at gsignal.c:2100
#7  0x403fc8fd in gtk_signal_emit (object=0x80df0c0, signal_id=23) at gtksignal.c:355
#8  0x40489594 in gtk_widget_set_style_internal (widget=0x80df0c0, style=0x80baad8, 
    initial_emission=0) at gtkwidget.c:4229
#9  0x40488c1c in gtk_widget_reset_rc_style (widget=0x80df0c0) at gtkwidget.c:3904
#10 0x4048981b in reset_rc_styles_recurse (widget=0x80df0c0, data=0x0)
    at gtkwidget.c:4302
#11 0x404898f7 in gtk_widget_reset_rc_styles (widget=0x80df0c0) at gtkwidget.c:4315
#12 0x403ee9d6 in gtk_rc_reset_widgets (context=0x80b7e88) at gtkrc.c:1258
#13 0x403eee2e in gtk_rc_reparse_all_for_settings (settings=0x80b7c78, force_load=1)
    at gtkrc.c:1430
#14 0x403ed724 in gtk_rc_settings_changed (settings=0x80b7c78, pspec=0x80a6298, 
    context=0x80b7e88) at gtkrc.c:520
#15 0x408e3be0 in g_cclosure_marshal_VOID__PARAM (closure=0x80b80e8, return_value=0x0, 
    n_param_values=2, param_values=0xbffff310, invocation_hint=0xbffff218, 
    marshal_data=0x0) at gmarshal.c:531
#16 0x408cee0a in g_closure_invoke (closure=0x80b80e8, return_value=0x0, 
    n_param_values=2, param_values=0xbffff310, invocation_hint=0xbffff218)
    at gclosure.c:437
#17 0x408e25cb in signal_emit_unlocked_R (node=0x80a4ae8, detail=119, 
    instance=0x80b7c78, emission_return=0x0, instance_and_params=0xbffff310)
    at gsignal.c:2341
#18 0x408e0dce in g_signal_emit_valist (instance=0x80b7c78, signal_id=1, detail=119, 
    var_args=0xbffff4a0) at gsignal.c:2100
#19 0x408e104b in g_signal_emit (instance=0x80b7c78, signal_id=1, detail=119)
    at gsignal.c:2144
#20 0x408d0938 in g_object_dispatch_properties_changed (object=0x80b7c78, n_pspecs=1, 
    pspecs=0xbffff510) at gobject.c:458
#21 0x408d0189 in g_object_notify_dispatcher (object=0x80b7c78, n_pspecs=1, 
    pspecs=0xbffff510) at gobject.c:230
#22 0x408d0e21 in g_object_notify (object=0x80b7c78, 
    property_name=0x8131278 "gtk-theme-name") at gobjectnotifyqueue.c:123
#23 0x403fbbe2 in _gtk_settings_handle_event (event=0x80b5430) at gtksettings.c:949
#24 0x403bcf8e in gtk_main_do_event (event=0x80b5430) at gtkmain.c:1206
#25 0x40552b63 in gdk_event_dispatch (source=0x80b6538, callback=0, user_data=0x0)
    at gdkevents-x11.c:1816
#26 0x40936696 in g_main_dispatch (context=0x80b6580) at gmain.c:1617
#27 0x409374ad in g_main_context_dispatch (context=0x80b6580) at gmain.c:2161
#28 0x40937840 in g_main_context_iterate (context=0x80b6580, block=1, dispatch=1, 
    self=0x80a70a8) at gmain.c:2242
#29 0x40937ee6 in g_main_loop_run (loop=0x8131058) at gmain.c:2462
#30 0x4037b44e in gtk_dialog_run (dialog=0x80df0c0) at gtkdialog.c:958
#31 0x080946d2 in panel_shell_register () at panel-shell.c:58
#32 0x0805b576 in main (argc=1, argv=0xbffff7f4) at main.c:190
#33 0x40995507 in __libc_start_main (main=0x805b4d0 <main>, argc=1, ubp_av=0xbffff7f4, 
    init=0x8057648 <_init>, fini=0x8096120 <_fini>, rtld_fini=0x4000dc14 <_dl_fini>, 
    stack_end=0xbffff7ec) at ../sysdeps/generic/libc-start.c:129
