Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.00 (KDE 4.3.0) "release 155"
Qt Version: 4.5.2
Operating System: Linux 2.6.27.25-0.1-default i686

What I was doing when the application crashed:
I moved the taskbar from the bottom of the screen to the top of the screen, and when I clicked the options button (the yellow thing), plasma crashed

 -- Backtrace:
Application: Área de trabajo de Plasma (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb5eb7700 (LWP 10452))]

Thread 2 (Thread 0xa91b5b90 (LWP 10455)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7d3bc35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb7d9b582 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#3  0xb7610ad2 in ?? () from /usr/lib/libQtNetwork.so.4
#4  0xb7d9a572 in ?? () from /usr/lib/libQtCore.so.4
#5  0xb7d381b5 in start_thread () from /lib/libpthread.so.0
#6  0xb657f3be in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb5eb7700 (LWP 10452)):
[KCrash Handler]
#6  0xb6e3d5aa in QGraphicsItem::isWidget() const () from /usr/lib/libQtGui.so.4
#7  0xb6e771a7 in QGraphicsScene::event(QEvent*) () from /usr/lib/libQtGui.so.4
#8  0xb68567fc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#9  0xb685eaee in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#10 0xb734927d in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#11 0xb7e8f16b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#12 0xb6e894f5 in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#13 0xb6ce0e95 in ?? () from /usr/lib/libQtGui.so.4
#14 0xb7e8e37a in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#15 0xb68567da in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#16 0xb685ebd2 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#17 0xb734927d in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#18 0xb7e8f16b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#19 0xb68acead in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#20 0xb6c3e5f3 in QFrame::event(QEvent*) () from /usr/lib/libQtGui.so.4
#21 0xb6cdf38d in QAbstractScrollArea::event(QEvent*) () from /usr/lib/libQtGui.so.4
#22 0xb6e861a6 in QGraphicsView::event(QEvent*) () from /usr/lib/libQtGui.so.4
#23 0xb68567fc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#24 0xb685ebd2 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#25 0xb734927d in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#26 0xb7e8f16b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#27 0xb685d6e1 in QApplication::setActiveWindow(QWidget*) () from /usr/lib/libQtGui.so.4
#28 0xb68cd20d in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#29 0xb68f75ea in ?? () from /usr/lib/libQtGui.so.4
#30 0xb63fc9c8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#31 0xb6400083 in ?? () from /usr/lib/libglib-2.0.so.0
#32 0xb6400241 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#33 0xb7eba8d8 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#34 0xb68f6ce5 in ?? () from /usr/lib/libQtGui.so.4
#35 0xb7e8d78a in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#36 0xb7e8dbd2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#37 0xb7e90079 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#38 0xb6856677 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#39 0xb48e4b30 in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#40 0x0804e505 in _start ()

Reported using DrKonqi