Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-15-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
I was moving a folder from a Folder View plasmoid to a Dolphin folder and at the same time the folder preview was working. 

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 3963)]

Thread 2 (Thread 0xa7e2db90 (LWP 3966)):
#0  0xb7ff8430 in __kernel_vsyscall ()
#1  0xb65100e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb66f02ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7df6172 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xb7733ac2 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0xb7df5132 in ?? () from /usr/lib/libQtCore.so.4
#6  0xb650c4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb66e149e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb6019a10 (LWP 3963)):
[KCrash Handler]
#6  0xb6fd8da8 in QGraphicsScene::drawItems () from /usr/lib/libQtGui.so.4
#7  0xb6fee61c in QGraphicsView::drawItems () from /usr/lib/libQtGui.so.4
#8  0xb6ffb022 in QGraphicsView::paintEvent () from /usr/lib/libQtGui.so.4
#9  0xb69fd74e in QWidget::event () from /usr/lib/libQtGui.so.4
#10 0xb6daea53 in QFrame::event () from /usr/lib/libQtGui.so.4
#11 0xb6e4ec2f in QAbstractScrollArea::viewportEvent () from /usr/lib/libQtGui.so.4
#12 0xb6ff99b2 in QGraphicsView::viewportEvent () from /usr/lib/libQtGui.so.4
#13 0xb6e51235 in ?? () from /usr/lib/libQtGui.so.4
#14 0xb7ee8dea in QCoreApplicationPrivate::sendThroughObjectEventFilters () from /usr/lib/libQtCore.so.4
#15 0xb69a6d1a in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#16 0xb69af122 in QApplication::notify () from /usr/lib/libQtGui.so.4
#17 0xb74b785d in KApplication::notify () from /usr/lib/libkdeui.so.5
#18 0xb7ee9bcb in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#19 0xb69b1e8e in QCoreApplication::sendSpontaneousEvent () from /usr/lib/libQtGui.so.4
#20 0xb6a054e9 in QWidgetPrivate::drawWidget () from /usr/lib/libQtGui.so.4
#21 0xb6a05c8e in QWidgetPrivate::paintSiblingsRecursive () from /usr/lib/libQtGui.so.4
#22 0xb6a050da in QWidgetPrivate::drawWidget () from /usr/lib/libQtGui.so.4
#23 0xb6a05c8e in QWidgetPrivate::paintSiblingsRecursive () from /usr/lib/libQtGui.so.4
#24 0xb6a050da in QWidgetPrivate::drawWidget () from /usr/lib/libQtGui.so.4
#25 0xb6b969ca in ?? () from /usr/lib/libQtGui.so.4
#26 0xb69f5a06 in QWidgetPrivate::syncBackingStore () from /usr/lib/libQtGui.so.4
#27 0xb69fdbb5 in QWidget::event () from /usr/lib/libQtGui.so.4
#28 0xb69a6d3c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#29 0xb69af122 in QApplication::notify () from /usr/lib/libQtGui.so.4
#30 0xb74b785d in KApplication::notify () from /usr/lib/libkdeui.so.5
#31 0xb7ee9bcb in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#32 0xb7eea825 in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#33 0xb7eeaa1d in QCoreApplication::sendPostedEvents () from /usr/lib/libQtCore.so.4
#34 0xb7f156af in ?? () from /usr/lib/libQtCore.so.4
#35 0xb6559b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#36 0xb655d0eb in ?? () from /usr/lib/libglib-2.0.so.0
#37 0xb655d268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#38 0xb7f152f8 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#39 0xb6a48a75 in ?? () from /usr/lib/libQtGui.so.4
#40 0xb7ee81fa in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#41 0xb7ee8642 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#42 0xb7eeaae9 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#43 0xb69a6bb7 in QApplication::exec () from /usr/lib/libQtGui.so.4
#44 0xb3bcf310 in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#45 0x0804e27d in _start ()

Reported using DrKonqi