Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.27.30-170.2.82.fc10.x86_64 x86_64
Distribution: "Fedora release 10 (Cambridge)"

What I was doing when the application crashed:
I dragged a notification stating that the explode effect could not be activated, then plasma crashed and restarted. A wierd scroll bar shown on desktop after restart

 -- Backtrace:
Application: Plasma Workspace (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f845c39a820 (LWP 3577))]

Thread 2 (Thread 0x7f84467e7950 (LWP 3596)):
#0  0x0000003bd640b309 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000038dc85b5b9 in QWaitCondition::wait () from /usr/lib64/libQtCore.so.4
#2  0x00000038de283f3c in ?? () from /usr/lib64/libQtNetwork.so.4
#3  0x00000038dc85a5d5 in ?? () from /usr/lib64/libQtCore.so.4
#4  0x0000003bd64073da in start_thread () from /lib64/libpthread.so.0
#5  0x0000003bd58e62bd in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f845c39a820 (LWP 3577)):
[KCrash Handler]
#5  0x0000003240eff814 in Plasma::ExtenderItem::group () from /usr/lib64/libplasma.so.3
#6  0x0000003240efdfd8 in Plasma::ExtenderGroup::items () from /usr/lib64/libplasma.so.3
#7  0x00007f8447b69c7f in Plasma::Theme::font () from /usr/lib64/kde4/plasma_applet_systemtray.so
#8  0x00007f8447b6a67d in Plasma::Theme::font () from /usr/lib64/kde4/plasma_applet_systemtray.so
#9  0x00000038dc958f52 in QMetaObject::activate () from /usr/lib64/libQtCore.so.4
#10 0x00007f8447b6adc2 in Plasma::Theme::font () from /usr/lib64/kde4/plasma_applet_systemtray.so
#11 0x00007f8447b6be67 in Plasma::Theme::font () from /usr/lib64/kde4/plasma_applet_systemtray.so
#12 0x00000038dc958f52 in QMetaObject::activate () from /usr/lib64/libQtCore.so.4
#13 0x00007f8447b6cf07 in Plasma::Theme::font () from /usr/lib64/kde4/plasma_applet_systemtray.so
#14 0x00007f8447b6d3db in Plasma::Theme::font () from /usr/lib64/kde4/plasma_applet_systemtray.so
#15 0x00007f8447b7a801 in Plasma::Theme::font () from /usr/lib64/kde4/plasma_applet_systemtray.so
#16 0x00000038dc9540f5 in QObject::event () from /usr/lib64/libQtCore.so.4
#17 0x00000038dd39008d in QApplicationPrivate::notify_helper () from /usr/lib64/libQtGui.so.4
#18 0x00000038dd3982ca in QApplication::notify () from /usr/lib64/libQtGui.so.4
#19 0x000000323c212bbb in KApplication::notify () from /usr/lib64/libkdeui.so.5
#20 0x00000038dc94407c in QCoreApplication::notifyInternal () from /usr/lib64/libQtCore.so.4
#21 0x00000038dc944cea in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib64/libQtCore.so.4
#22 0x00000038dc96d903 in ?? () from /usr/lib64/libQtCore.so.4
#23 0x0000003bd70377bb in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#24 0x0000003bd703af8d in ?? () from /lib64/libglib-2.0.so.0
#25 0x0000003bd703b14b in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#26 0x00000038dc96d58f in QEventDispatcherGlib::processEvents () from /usr/lib64/libQtCore.so.4
#27 0x00000038dd4274cf in ?? () from /usr/lib64/libQtGui.so.4
#28 0x00000038dc942912 in QEventLoop::processEvents () from /usr/lib64/libQtCore.so.4
#29 0x00000038dc942ce4 in QEventLoop::exec () from /usr/lib64/libQtCore.so.4
#30 0x00000038dc944fb4 in QCoreApplication::exec () from /usr/lib64/libQtCore.so.4
#31 0x000000323e63adcb in kdemain () from /usr/lib64/libkdeinit4_plasma-desktop.so
#32 0x0000003bd581e576 in __libc_start_main () from /lib64/libc.so.6
#33 0x0000000000400779 in _start ()

Reported using DrKonqi