Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-15-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
In the plasma desktop settings window, when the activity type was changed to folder view, this crash occured.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb778d700 (LWP 1994))]

Thread 2 (Thread 0xac699b70 (LWP 1996)):
#0  0x00f34422 in __kernel_vsyscall ()
#1  0x004a0e15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x0091978d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x0015fe67 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#4  0x07dc3922 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0x0015ee32 in ?? () from /usr/lib/libQtCore.so.4
#6  0x0049c80e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0x0090c7ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb778d700 (LWP 1994)):
[KCrash Handler]
#6  0x048ac18a in QGraphicsItem::isWidget() const () from /usr/lib/libQtGui.so.4
#7  0x048e5527 in QGraphicsScene::event(QEvent*) () from /usr/lib/libQtGui.so.4
#8  0x042a8f54 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#9  0x042b067c in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#10 0x01107bfa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#11 0x0024f6cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#12 0x048f65e7 in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib/libQtGui.so.4
#13 0x0474ea95 in ?? () from /usr/lib/libQtGui.so.4
#14 0x0024e83a in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#15 0x042a8f2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#16 0x042b05ca in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#17 0x01107bfa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#18 0x0024f6cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#19 0x042fdad5 in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#20 0x046ad633 in QFrame::event(QEvent*) () from /usr/lib/libQtGui.so.4
#21 0x0474cfaa in QAbstractScrollArea::event(QEvent*) () from /usr/lib/libQtGui.so.4
#22 0x048f6406 in QGraphicsView::event(QEvent*) () from /usr/lib/libQtGui.so.4
#23 0x042a8f54 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#24 0x042b05ca in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#25 0x01107bfa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#26 0x0024f6cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#27 0x042b3df6 in QApplication::setActiveWindow(QWidget*) () from /usr/lib/libQtGui.so.4
#28 0x0431d21f in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#29 0x0434a502 in ?? () from /usr/lib/libQtGui.so.4
#30 0x00d43e78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#31 0x00d47720 in ?? () from /lib/libglib-2.0.so.0
#32 0x00d47853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#33 0x0027a02c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#34 0x04349be5 in ?? () from /usr/lib/libQtGui.so.4
#35 0x0024dc79 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#36 0x0024e0ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#37 0x0025053f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#38 0x042a8dd7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#39 0x0143c80d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#40 0x0804dde1 in _start ()

Reported using DrKonqi