#0  0x028255e8 in g_logv (log_domain=0x32b8ca8 "Gtk", log_level=G_LOG_LEVEL_CRITICAL, format=0x28c3d90 "%s: assertion `%s' failed", 
    args1=0xbfffe01c "h,0\003,0\003,0\003h,0\003??+\003,0\003P=?\001????K?\"\003??+\003h,0\003,0\003??x\002???\001L") at gmessages.c:570
#1  0x02825741 in g_log (log_domain=0x32b8ca8 "Gtk", log_level=G_LOG_LEVEL_CRITICAL, format=0x28c3d90 "%s: assertion `%s' failed") at gmessages.c:591
#2  0x02825798 in g_return_if_fail_warning (log_domain=0x32b8ca8 "Gtk", pretty_function=0x3302c68 "gtk_drag_set_icon_name", 
    expression=0x3302c7f "screen != NULL") at gmessages.c:600
#3  0x03229b4b in gtk_drag_set_icon_name (context=0x1ca3d50, icon_name=0x9c69470 "audio-x-generic", hot_x=-2, hot_y=-2) at gtkdnd-quartz.c:1844
#4  0x03227d69 in gtk_drag_begin_internal (widget=0x1c29de0, site=0x6b45540, target_list=0x6c5e248, actions=6, button=1, event=0x18e9198)
    at gtkdnd-quartz.c:1251
#5  0x03228162 in gtk_drag_source_event_cb (widget=0x1c29de0, event=0x18e9198, data=0x6b45540) at gtkdnd-quartz.c:1330
#6  0x030561de in _gtk_marshal_BOOLEAN__BOXED (closure=0x6b456f0, return_value=0xbfffe3d0, n_param_values=2, param_values=0x1d94ea0, 
    invocation_hint=0xbfffe400, marshal_data=0x0) at gtkmarshalers.c:86
#7  0x0276c5bf in g_closure_invoke (closure=0x6b456f0, return_value=0xbfffe3d0, n_param_values=2, param_values=0x1d94ea0, invocation_hint=0xbfffe400)
    at gclosure.c:774
#8  0x0278cbbe in signal_emit_unlocked_R (node=0x67cba80, detail=0, instance=0x1c29de0, emission_return=0xbfffe5e8, instance_and_params=0x1d94ea0)
    at gsignal.c:3272
#9  0x0278b98c in g_signal_emit_valist (instance=0x1c29de0, signal_id=52, detail=0, var_args=0xbfffe760 "p???\004") at gsignal.c:3013
#10 0x0278bdb1 in g_signal_emit (instance=0x1c29de0, signal_id=52, detail=0) at gsignal.c:3060
#11 0x03202e9d in gtk_widget_event_internal (widget=0x1c29de0, event=0x18e9198) at gtkwidget.c:5060
#12 0x0320290f in gtk_widget_event (widget=0x1c29de0, event=0x18e9198) at gtkwidget.c:4848
#13 0x03053fce in gtk_propagate_event (widget=0x1c29de0, event=0x18e9198) at gtkmain.c:2493
#14 0x0305254a in gtk_main_do_event (event=0x18e9198) at gtkmain.c:1688
#15 0x023d6359 in gdk_event_dispatch (source=0x10bdba0, callback=0, user_data=0x0) at gdkeventloop-quartz.c:677
#16 0x02817d31 in g_main_dispatch (context=0x10bdc00) at gmain.c:2441
#17 0x0281962b in g_main_context_dispatch (context=0x10bdc00) at gmain.c:3011
#18 0x02819c5a in g_main_context_iterate (context=0x10bdc00, block=1, dispatch=1, self=0x10a08e0) at gmain.c:3089
#19 0x0281a59d in g_main_loop_run (loop=0x6c5d8c0) at gmain.c:3297
#20 0x030519f0 in gtk_main () at gtkmain.c:1257
