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

I have four activities configured, 1st one with folder views, 2nd with comics, 3rd with utils and 4th just plan to see wall paper :-).

I tried adding a new folder view applet to the first activity and the plasma crashed. Here is the back trace given during the crash.

Application: Plasma Workspace (plasma), signal SIGSEGV
[Current thread is 0 (LWP 18778)]

Thread 7 (Thread 0xa9c2ab90 (LWP 18785)):
#0  0xb7f65430 in __kernel_vsyscall ()
#1  0xb581d075 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb63e6bbd in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb65d06f2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xb7929532 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0xb65cf6ae in ?? () from /usr/lib/libQtCore.so.4
#6  0xb581950f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb63d8a0e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 6 (Thread 0xa862fb90 (LWP 18790)):
#0  0xb7f65430 in __kernel_vsyscall ()
#1  0xb581d075 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb63e6bbd in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb65d06f2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xa9df3c8a in ?? () from /usr/lib/kde4/plasma_wallpaper_image.so
#5  0xb65cf6ae in ?? () from /usr/lib/libQtCore.so.4
#6  0xb581950f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb63d8a0e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 5 (Thread 0xa7e2eb90 (LWP 18961)):
#0  0xb7f65430 in __kernel_vsyscall ()
#1  0xb581d075 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb63e6bbd in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb65d06f2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xa9df3c8a in ?? () from /usr/lib/kde4/plasma_wallpaper_image.so
#5  0xb65cf6ae in ?? () from /usr/lib/libQtCore.so.4
#6  0xb581950f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb63d8a0e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 4 (Thread 0xa7614b90 (LWP 19361)):
#0  0xb7f65430 in __kernel_vsyscall ()
#1  0xb63d0df1 in select () from /lib/tls/i686/cmov/libc.so.6
#2  0xb669f150 in ?? () from /usr/lib/libQtCore.so.4
#3  0xb65cf6ae in ?? () from /usr/lib/libQtCore.so.4
#4  0xb581950f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#5  0xb63d8a0e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 3 (Thread 0xa69b6b90 (LWP 24356)):
#0  0xb7f65430 in __kernel_vsyscall ()
#1  0xb581d075 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb63e6bbd in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb65d06f2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xa9df3c8a in ?? () from /usr/lib/kde4/plasma_wallpaper_image.so
#5  0xb65cf6ae in ?? () from /usr/lib/libQtCore.so.4
#6  0xb581950f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb63d8a0e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread 0xa262ab90 (LWP 24359)):
#0  0xb7f65430 in __kernel_vsyscall ()
#1  0xb581d075 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb63e6bbd in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb65d06f2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xa9df3c8a in ?? () from /usr/lib/kde4/plasma_wallpaper_image.so
#5  0xb65cf6ae in ?? () from /usr/lib/libQtCore.so.4
#6  0xb581950f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb63d8a0e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb53966c0 (LWP 18778)):
[KCrash Handler]
#6  0xb7aca726 in KFileItemDelegate::Private::labelRectangle () from /usr/lib/libkio.so.5
#7  0xb7acdca6 in KFileItemDelegate::Private::layoutTextItems () from /usr/lib/libkio.so.5
#8  0xb7acebc9 in KFileItemDelegate::shape () from /usr/lib/libkio.so.5
#9  0xb7acf22b in KFileItemDelegate::qt_metacall () from /usr/lib/libkio.so.5
#10 0xb66c8a7a in QMetaObject::invokeMethod () from /usr/lib/libQtCore.so.4
#11 0xa9d21a6f in ?? () from /usr/lib/kde4/plasma_applet_folderview.so
#12 0xa9d21d07 in ?? () from /usr/lib/kde4/plasma_applet_folderview.so
#13 0xa9d1e3a3 in ?? () from /usr/lib/kde4/plasma_applet_folderview.so
#14 0xb6ecc065 in QGraphicsItem::sceneEvent () from /usr/lib/libQtGui.so.4
#15 0xb6f0f7af in QGraphicsWidget::sceneEvent () from /usr/lib/libQtGui.so.4
#16 0xb6eea54c in ?? () from /usr/lib/libQtGui.so.4
#17 0xb6eeba2a in ?? () from /usr/lib/libQtGui.so.4
#18 0xb6ef31e3 in ?? () from /usr/lib/libQtGui.so.4
#19 0xb6ef35af in QGraphicsScene::mouseMoveEvent () from /usr/lib/libQtGui.so.4
#20 0xb6ef37c7 in QGraphicsScene::event () from /usr/lib/libQtGui.so.4
#21 0xb694f8ec in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#22 0xb695772e in QApplication::notify () from /usr/lib/libQtGui.so.4
#23 0xb76b3fed in KApplication::notify () from /usr/lib/libkdeui.so.5
#24 0xb66bfe61 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#25 0xb6f00d88 in ?? () from /usr/lib/libQtGui.so.4
#26 0xb6f09316 in QGraphicsView::mouseMoveEvent () from /usr/lib/libQtGui.so.4
#27 0xb69a77cb in QWidget::event () from /usr/lib/libQtGui.so.4
#28 0xb6cdefd3 in QFrame::event () from /usr/lib/libQtGui.so.4
#29 0xb6d757df in QAbstractScrollArea::viewportEvent () from /usr/lib/libQtGui.so.4
#30 0xb6f02d0f in QGraphicsView::viewportEvent () from /usr/lib/libQtGui.so.4
#31 0xb6d77d85 in ?? () from /usr/lib/libQtGui.so.4
#32 0xb66bf04a in QCoreApplicationPrivate::sendThroughObjectEventFilters () from /usr/lib/libQtCore.so.4
#33 0xb694f8ca in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#34 0xb69580e1 in QApplication::notify () from /usr/lib/libQtGui.so.4
#35 0xb76b3fed in KApplication::notify () from /usr/lib/libkdeui.so.5
#36 0xb66bfe61 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#37 0xb695736e in QApplicationPrivate::sendMouseEvent () from /usr/lib/libQtGui.so.4
#38 0xb69c1656 in ?? () from /usr/lib/libQtGui.so.4
#39 0xb69c09e5 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#40 0xb69ea7aa in ?? () from /usr/lib/libQtGui.so.4
#41 0xb565e6f8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#42 0xb5661da3 in ?? () from /usr/lib/libglib-2.0.so.0
#43 0xb5661f61 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#44 0xb66ea478 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#45 0xb69e9ea5 in ?? () from /usr/lib/libQtGui.so.4
#46 0xb66be52a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#47 0xb66be6ea in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#48 0xb7cfecae in ?? () from /usr/lib/libknewstuff2.so.4
#49 0xb7cfee9c in KNS::Engine::downloadDialogModal () from /usr/lib/libknewstuff2.so.4
#50 0xa9dea119 in ?? () from /usr/lib/kde4/plasma_wallpaper_image.so
#51 0xa9dec863 in ?? () from /usr/lib/kde4/plasma_wallpaper_image.so
#52 0xb66d4a60 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#53 0xb66d4e60 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#54 0xb6f3de61 in QAbstractButton::clicked () from /usr/lib/libQtGui.so.4
#55 0xb6c91199 in ?? () from /usr/lib/libQtGui.so.4
#56 0xb6c92d94 in ?? () from /usr/lib/libQtGui.so.4
#57 0xb6c93026 in QAbstractButton::mouseReleaseEvent () from /usr/lib/libQtGui.so.4
#58 0xb69a7962 in QWidget::event () from /usr/lib/libQtGui.so.4
#59 0xb6c9103e in QAbstractButton::event () from /usr/lib/libQtGui.so.4
#60 0xb6d37910 in QPushButton::event () from /usr/lib/libQtGui.so.4
#61 0xb694f8ec in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#62 0xb69580e1 in QApplication::notify () from /usr/lib/libQtGui.so.4
#63 0xb76b3fed in KApplication::notify () from /usr/lib/libkdeui.so.5
#64 0xb66bfe61 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#65 0xb695736e in QApplicationPrivate::sendMouseEvent () from /usr/lib/libQtGui.so.4
#66 0xb69c1656 in ?? () from /usr/lib/libQtGui.so.4
#67 0xb69c09e5 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#68 0xb69ea7aa in ?? () from /usr/lib/libQtGui.so.4
#69 0xb565e6f8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#70 0xb5661da3 in ?? () from /usr/lib/libglib-2.0.so.0
#71 0xb5661f61 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#72 0xb66ea478 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#73 0xb69e9ea5 in ?? () from /usr/lib/libQtGui.so.4
#74 0xb66be52a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#75 0xb66be6ea in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#76 0xb66c0da5 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#77 0xb694f767 in QApplication::exec () from /usr/lib/libQtGui.so.4
#78 0xb7ef7456 in kdemain () from /usr/lib/libkdeinit4_plasma.so
#79 0x08048712 in _start ()