Version:            (using KDE 4.2.2)
OS:                Linux
Installed from:    Fedora RPMs

I believe this may have occurred because I kept my KDE settings from Slackware (I've recently reinstalled Fedora).

When switching from Folder View back to the Default containment view, plasma breaks temporarily and puts this message out:
---------------------------------------
A Fatal Error Occurred
The application Plasma Workspace (plasma) crashed and caused the signal 11 (SIGSEGV).
---------------------------------------
And this information:
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Application: Plasma Workspace (plasma), signal SIGSEGV
[Current thread is 1 (Thread 0xb80ae9a0 (LWP 4423))]

Thread 5 (Thread 0xacfa2b90 (LWP 4424)):
#0  0x009c2416 in __kernel_vsyscall ()
#1  0x00cc6105 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0x027b4102 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#3  0x0092b092 in ?? () from /usr/lib/libQtNetwork.so.4
#4  0x027b30be in ?? () from /usr/lib/libQtCore.so.4
#5  0x00cc251f in start_thread () from /lib/libpthread.so.0
#6  0x0923804e in clone () from /lib/libc.so.6

Thread 4 (Thread 0xac5a1b90 (LWP 4425)):
#0  0x009c2416 in __kernel_vsyscall ()
#1  0x00cc6105 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0x027b4102 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#3  0x0472fdca in ?? () from /usr/lib/kde4/plasma_wallpaper_image.so
#4  0x027b30be in ?? () from /usr/lib/libQtCore.so.4
#5  0x00cc251f in start_thread () from /lib/libpthread.so.0
#6  0x0923804e in clone () from /lib/libc.so.6

Thread 3 (Thread 0xab6a8b90 (LWP 4645)):
#0  0x009c2416 in __kernel_vsyscall ()
#1  0x092303d1 in select () from /lib/libc.so.6
#2  0x02882f87 in ?? () from /usr/lib/libQtCore.so.4
#3  0x027b30be in ?? () from /usr/lib/libQtCore.so.4
#4  0x00cc251f in start_thread () from /lib/libpthread.so.0
#5  0x0923804e in clone () from /lib/libc.so.6

Thread 2 (Thread 0xaa2a6b90 (LWP 4648)):
#0  0x009c2416 in __kernel_vsyscall ()
#1  0x00cc6105 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0x027b4102 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#3  0x0472fdca in ?? () from /usr/lib/kde4/plasma_wallpaper_image.so
#4  0x027b30be in ?? () from /usr/lib/libQtCore.so.4
#5  0x00cc251f in start_thread () from /lib/libpthread.so.0
#6  0x0923804e in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb80ae9a0 (LWP 4423)):
[KCrash Handler]
#6  0x018b3f9a in QGraphicsItem::isWidget () from /usr/lib/libQtGui.so.4
#7  0x018e1ed7 in QGraphicsScene::event () from /usr/lib/libQtGui.so.4
#8  0x0133efec in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#9  0x01346e2e in QApplication::notify () from /usr/lib/libQtGui.so.4
#10 0x010490fd in KApplication::notify () from /usr/lib/libkdeui.so.5
#11 0x028a3b21 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#12 0x018f1026 in QGraphicsView::viewportEvent () from /usr/lib/libQtGui.so.4
#13 0x01765ff5 in ?? () from /usr/lib/libQtGui.so.4
#14 0x028a2d0a in QCoreApplicationPrivate::sendThroughObjectEventFilters () from /usr/lib/libQtCore.so.4
#15 0x0133efca in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#16 0x01346efa in QApplication::notify () from /usr/lib/libQtGui.so.4
#17 0x010490fd in KApplication::notify () from /usr/lib/libkdeui.so.5
#18 0x028a3b21 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#19 0x01396b1d in QWidget::event () from /usr/lib/libQtGui.so.4
#20 0x016cd273 in QFrame::event () from /usr/lib/libQtGui.so.4
#21 0x0176451d in QAbstractScrollArea::event () from /usr/lib/libQtGui.so.4
#22 0x018ea984 in QGraphicsView::event () from /usr/lib/libQtGui.so.4
#23 0x0133efec in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#24 0x01346efa in QApplication::notify () from /usr/lib/libQtGui.so.4
#25 0x010490fd in KApplication::notify () from /usr/lib/libkdeui.so.5
#26 0x028a3b21 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#27 0x01345c93 in QApplication::setActiveWindow () from /usr/lib/libQtGui.so.4
#28 0x013afa94 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#29 0x013d877a in ?? () from /usr/lib/libQtGui.so.4
#30 0x0634e238 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#31 0x063518e3 in ?? () from /lib/libglib-2.0.so.0
#32 0x06351aa1 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#33 0x028ce158 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#34 0x013d7e75 in ?? () from /usr/lib/libQtGui.so.4
#35 0x028a21ea in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#36 0x028a23aa in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#37 0x028a4a65 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#38 0x0133ee67 in QApplication::exec () from /usr/lib/libQtGui.so.4
#39 0x00e581d6 in kdemain () from /usr/lib/libkdeinit4_plasma.so
#40 0x080486f2 in _start ()
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