Application that crashed: dragon
Version of the application: 2.0
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.29.6-217.2.16.fc11.x86_64 x86_64
Distribution: "Fedora release 11 (Leonidas)"

What I was doing when the application crashed:
Dragon player wasn't playing anything. In system settings, I changed the multimedia backend from gstreamer to xine then hit apply. Dragon player and knotify immediately crashed.

 -- Backtrace:
Application: Dragon Player (dragon), signal: Aborted
[KCrash Handler]
#5  0x00000037292332f5 in *__GI_raise (sig=<value optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#6  0x0000003729234b20 in *__GI_abort () at abort.c:88
#7  0x00007f4bc4e21194 in qt_message_output (msgType=QtFatalMsg, buf=<value optimized out>) at global/qglobal.cpp:2042
#8  0x00007f4bc4e212e6 in qFatal (msg=<value optimized out>) at global/qglobal.cpp:2241
#9  0x00007f4bbc0b11d8 in Phonon::Gstreamer::VideoWidget::setupVideoBin (this=0x1444a40) at /usr/src/debug/phonon-4.3.1/gstreamer/videowidget.cpp:80
#10 0x00007f4bbc0b1502 in Phonon::Gstreamer::VideoWidget::VideoWidget(struct Phonon::Gstreamer::Backend *, struct QWidget *) (this=0x1444a40, backend=0x18c0bc0, parent=<value optimized out>)
    at /usr/src/debug/phonon-4.3.1/gstreamer/videowidget.cpp:58
#11 0x00007f4bbc0a1154 in Phonon::Gstreamer::Backend::createObject (this=0x18c0bc0, c=<value optimized out>, parent=0x14fe630, args=<value optimized out>)
    at /usr/src/debug/phonon-4.3.1/gstreamer/backend.cpp:133
#12 0x000000373fc33e52 in Phonon::Factory::createVideoWidget (parent=0x14fe630) at /usr/src/debug/phonon-4.3.1/phonon/factory.cpp:326
#13 0x000000373fc389d6 in Phonon::VideoWidgetPrivate::createBackendObject (this=0x14c8410) at /usr/src/debug/phonon-4.3.1/phonon/videowidget.cpp:75
#14 0x000000373fc34370 in Phonon::FactoryPrivate::phononBackendChanged (this=0x14f3470) at /usr/src/debug/phonon-4.3.1/phonon/factory.cpp:281
#15 0x000000373fc34557 in Phonon::FactoryPrivate::qt_metacall (this=0x14f3470, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff9f9388a0)
    at /usr/src/debug/phonon-4.3.1/x86_64-redhat-linux-gnu/phonon/factory.moc:71
#16 0x00007f4bc5224f84 in QDBusConnectionPrivate::deliverCall (this=<value optimized out>, object=<value optimized out>, msg=<value optimized out>, metaTypes=@0x18f59e0, 
    slotIdx=<value optimized out>) at qdbusintegrator.cpp:891
#17 0x00007f4bc522c73f in QDBusCallDeliveryEvent::placeMetaCall (this=0x0, object=0xe39) at qdbusintegrator_p.h:101
#18 0x00007f4bc4f1e309 in QObject::event (this=0x14f3470, e=0x18f5990) at kernel/qobject.cpp:1111
#19 0x00007f4bc43c069c in QApplicationPrivate::notify_helper (this=0x13c5c20, receiver=0x14f3470, e=0x18f5990) at kernel/qapplication.cpp:4056
#20 0x00007f4bc43c76ce in QApplication::notify (this=0x7fff9f9391e0, receiver=0x14f3470, e=0x18f5990) at kernel/qapplication.cpp:4021
#21 0x00007f4bc6538296 in KApplication::notify (this=0x7fff9f9391e0, receiver=0x14f3470, event=0x18f5990) at /usr/src/debug/kdelibs-4.3.0/kdeui/kernel/kapplication.cpp:302
#22 0x00007f4bc4f0ecbc in QCoreApplication::notifyInternal (this=0x7fff9f9391e0, receiver=0x14f3470, event=0x18f5990) at kernel/qcoreapplication.cpp:610
#23 0x00007f4bc4f0f8c8 in QCoreApplication::sendEvent (event=<value optimized out>, receiver=<value optimized out>) at kernel/qcoreapplication.h:213
#24 QCoreApplicationPrivate::sendPostedEvents (event=<value optimized out>, receiver=<value optimized out>) at kernel/qcoreapplication.cpp:1247
#25 0x00007f4bc4f37743 in QCoreApplication::sendPostedEvents () at kernel/qcoreapplication.h:218
#26 postEventSourceDispatch () at kernel/qeventdispatcher_glib.cpp:210
#27 0x000000372aa37abe in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#28 0x000000372aa3b278 in ?? () from /lib64/libglib-2.0.so.0
#29 0x000000372aa3b3a0 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#30 0x00007f4bc4f373b6 in QEventDispatcherGlib::processEvents (this=0x13acb10, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#31 0x00007f4bc445342e in QGuiEventDispatcherGlib::processEvents (this=0xe39, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#32 0x00007f4bc4f0d5f2 in QEventLoop::processEvents (this=<value optimized out>, flags={i = 36}) at kernel/qeventloop.cpp:149
#33 0x00007f4bc4f0d9c4 in QEventLoop::exec (this=0x7fff9f939190, flags={i = 0}) at kernel/qeventloop.cpp:201
#34 0x00007f4bc4f0fb79 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#35 0x0000000000428003 in _start ()
Warning: the current language does not match this frame.

Reported using DrKonqi