Version:            (using KDE 4.2.0)
OS:                Linux
Installed from:    Ubuntu Packages

When I start KDE, all icons on my desktop (being a folder view) are gone. When I hover over (or select) an icon, plasma crashes. For some reason, it sometimes stops crashing after a while, and everything's fine. The same happens when I explicitly set the desktop type to a regular desktop, and then back to a folder view. It may also be noteworthy that I have two screens, and thus, two desktops.

Here's a backtrace:

Anwendung: Plasma-Arbeitsfläche (plasma), Signal SIGSEGV
[Current thread is 0 (LWP 24715)]

Thread 4 (Thread 0xa9b10b90 (LWP 24717)):
#0  0xb8030430 in __kernel_vsyscall ()
#1  0xb58b0075 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb64a4bbd in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb668e6f2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xb79e7532 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0xb668d6ae in ?? () from /usr/lib/libQtCore.so.4
#6  0xb58ac50f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb6496a0e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 3 (Thread 0xa92d0b90 (LWP 24724)):
#0  0xb8030430 in __kernel_vsyscall ()
#1  0xb58b0075 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb64a4bbd in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb668e6f2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xa9be4c8a in RenderThread::run (this=0x8754ef4) at /build/buildd/kdebase-workspace-4.2.0/plasma/wallpapers/image/renderthread.cpp:91
#5  0xb668d6ae in ?? () from /usr/lib/libQtCore.so.4
#6  0xb58ac50f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb6496a0e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread 0xa82fdb90 (LWP 24725)):
#0  0xb8030430 in __kernel_vsyscall ()
#1  0xb58b0075 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb64a4bbd in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb668e6f2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xa9be4c8a in RenderThread::run (this=0x876da2c) at /build/buildd/kdebase-workspace-4.2.0/plasma/wallpapers/image/renderthread.cpp:91
#5  0xb668d6ae in ?? () from /usr/lib/libQtCore.so.4
#6  0xb58ac50f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb6496a0e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb543c6c0 (LWP 24715)):
[KCrash Handler]
#6  KFileItemDelegate::Private::labelRectangle (this=0x872eb70, option=@0xbff2f160) at /build/buildd/kde4libs-4.2.0/kio/kio/kfileitemdelegate.cpp:192
#7  0xb7b8bca6 in KFileItemDelegate::Private::layoutTextItems (this=0x872eb70, option=@0xbff2f160, index=@0xbff2f7a8, labelLayout=0xbff2f204, infoLayout=0xbff2f200, textBoundingRect=0xbff2f1f0)
    at /build/buildd/kde4libs-4.2.0/kio/kio/kfileitemdelegate.cpp:670
#8  0xb7b8cbc9 in KFileItemDelegate::shape (this=0x872eaf0, option=@0xbff2f678, index=@0xbff2f7a8) at /build/buildd/kde4libs-4.2.0/kio/kio/kfileitemdelegate.cpp:1385
#9  0xb7b8d22b in KFileItemDelegate::qt_metacall (this=0x872eaf0, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0xbff2f364)
    at /build/buildd/kde4libs-4.2.0/obj-i486-linux-gnu/kio/kfileitemdelegate.moc:104
#10 0xb6786a7a in QMetaObject::invokeMethod () from /usr/lib/libQtCore.so.4
#11 0xa9c23c21 in IconView::visualRegion (this=0x8753eb8, index=@0xbff2f7a8) at /usr/include/qt4/QtCore/qobjectdefs.h:348
#12 0xa9c23f34 in IconView::indexAt (this=0x8753eb8, point=@0xbff2f828) at /build/buildd/kdebase-4.2.0/apps/plasma/applets/folderview/iconview.cpp:1008
#13 0xa9c2064d in IconView::hoverMoveEvent (this=0x8753eb8, event=0xbff2f964) at /build/buildd/kdebase-4.2.0/apps/plasma/applets/folderview/iconview.cpp:1183
#14 0xb6f8a04c in QGraphicsItem::sceneEvent () from /usr/lib/libQtGui.so.4
#15 0xb6fcd7af in QGraphicsWidget::sceneEvent () from /usr/lib/libQtGui.so.4
#16 0xb6fa854c in ?? () from /usr/lib/libQtGui.so.4
#17 0xb6fa9a2a in ?? () from /usr/lib/libQtGui.so.4
#18 0xb6fb12d1 in ?? () from /usr/lib/libQtGui.so.4
#19 0xb6fb15af in QGraphicsScene::mouseMoveEvent () from /usr/lib/libQtGui.so.4
#20 0xb6fb17c7 in QGraphicsScene::event () from /usr/lib/libQtGui.so.4
#21 0xb6a0d8ec in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#22 0xb6a1572e in QApplication::notify () from /usr/lib/libQtGui.so.4
#23 0xb7771fed in KApplication::notify (this=0x834c950, receiver=0x834a440, event=0xbff2fee0) at /build/buildd/kde4libs-4.2.0/kdeui/kernel/kapplication.cpp:307
#24 0xb677de61 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#25 0xb6fbed88 in ?? () from /usr/lib/libQtGui.so.4
#26 0xb6fc7316 in QGraphicsView::mouseMoveEvent () from /usr/lib/libQtGui.so.4
#27 0xb6a657cb in QWidget::event () from /usr/lib/libQtGui.so.4
#28 0xb6d9cfd3 in QFrame::event () from /usr/lib/libQtGui.so.4
#29 0xb6e337df in QAbstractScrollArea::viewportEvent () from /usr/lib/libQtGui.so.4
#30 0xb6fc0d0f in QGraphicsView::viewportEvent () from /usr/lib/libQtGui.so.4
#31 0xb6e35d85 in ?? () from /usr/lib/libQtGui.so.4
#32 0xb677d04a in QCoreApplicationPrivate::sendThroughObjectEventFilters () from /usr/lib/libQtCore.so.4
#33 0xb6a0d8ca in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#34 0xb6a160e1 in QApplication::notify () from /usr/lib/libQtGui.so.4
#35 0xb7771fed in KApplication::notify (this=0x834c950, receiver=0x8aa2318, event=0xbff30598) at /build/buildd/kde4libs-4.2.0/kdeui/kernel/kapplication.cpp:307
#36 0xb677de61 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#37 0xb6a1536e in QApplicationPrivate::sendMouseEvent () from /usr/lib/libQtGui.so.4
#38 0xb6a7f656 in ?? () from /usr/lib/libQtGui.so.4
#39 0xb6a7e9e5 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#40 0xb6aa87aa in ?? () from /usr/lib/libQtGui.so.4
#41 0xb56f16f8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#42 0xb56f4da3 in ?? () from /usr/lib/libglib-2.0.so.0
#43 0xb56f4f61 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#44 0xb67a8478 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#45 0xb6aa7ea5 in ?? () from /usr/lib/libQtGui.so.4
#46 0xb677c52a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#47 0xb677c6ea in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#48 0xb677eda5 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#49 0xb6a0d767 in QApplication::exec () from /usr/lib/libQtGui.so.4
#50 0xb7fb5456 in kdemain (argc=1, argv=0xbff30f94) at /build/buildd/kdebase-workspace-4.2.0/plasma/shells/desktop/main.cpp:54
#51 0x08048712 in main (argc=4, argv=0xc) at /build/buildd/kdebase-workspace-4.2.0/obj-i486-linux-gnu/plasma/shells/desktop/plasma_qgv_dummy.cpp:3