Gdk-CRITICAL **

[torwig]

Добрый день.
Столкнулся вот с такими вот сообщениями в QtCreator:

** (dualmode:2823): DEBUG: NP_Initialize
** (dualmode:2823): DEBUG: NP_Initialize succeeded
Failed to open debug file '/home/torwig/tmp/mozdebug'
** (dualmode:2823): DEBUG: NP_Initialize
** (dualmode:2823): DEBUG: NP_Initialize succeeded
** (dualmode:2823): DEBUG: NP_Initialize
** (dualmode:2823): DEBUG: NP_Initialize succeeded
** (dualmode:2823): DEBUG: NP_Initialize
** (dualmode:2823): DEBUG: NP_Initialize succeeded

(dualmode:2823): Gdk-CRITICAL **: IA__gdk_window_set_back_pixmap: assertion `GDK_IS_WINDOW (window)' failed

(dualmode:2823): Gdk-CRITICAL **: IA__gdk_window_get_origin: assertion `GDK_IS_WINDOW (window)' failed

(dualmode:2823): GLib-GObject-WARNING **: instance with invalid (NULL) class pointer

(dualmode:2823): GLib-GObject-CRITICAL **: g_signal_handlers_destroy: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed

(dualmode:2823): GLib-GObject-WARNING **: instance with invalid (NULL) class pointer

(dualmode:2823): GLib-GObject-CRITICAL **: g_signal_handlers_destroy: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed

И совсем не понимаю, что они значат. Приложение компилируется, работает, но через какое-то время просто вылетает. Убунта 11.10, Qt Creator 2.2.1. Может кто сталкивался с таким?
И еще вот такое сообщение выдает:
QLayout::addChildLayout: layout "horizontalLayout_7" already has a parent