Version:            (using Devel)
OS:                Linux
Installed from:    Compiled sources

openSUSE 11.0, KDE4.2 Factory

i got no idea at all. While working with the calendar application lightning (in thunderbird), there suddenly appears the crash manager and reports a SIGSEGV of plasma. Can't see, where the problem is, because all of my desktop is still existing and running. Here those things, that might help:

Crash Info:
------------
Anwendung: Plasma-Arbeitsfläche (plasma), Signal SIGSEGV
[Current thread is 0 (LWP 3503)]

Thread 2 (Thread 0xa8f6db90 (LWP 3504)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb6496c15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb64f4742 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#3  0xa975a79a in ?? () from /usr/lib/kde4/plasma_wallpaper_image.so
#4  0xb64f372e in ?? () from /usr/lib/libQtCore.so.4
#5  0xb6493175 in start_thread () from /lib/libpthread.so.0
#6  0xb62f3dae in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb4cc86d0 (LWP 3503)):
[KCrash Handler]
#6  0xb65ff331 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#7  0xa9496db3 in TaskManager::AbstractGroupingStrategy::groupRemoved () from /usr/lib/libtaskmanager.so.4
#8  0xa9497a76 in TaskManager::AbstractGroupingStrategy::closeGroup () from /usr/lib/libtaskmanager.so.4
#9  0xa949e2b7 in ?? () from /usr/lib/libtaskmanager.so.4
#10 0xa949eafb in ?? () from /usr/lib/libtaskmanager.so.4
#11 0xb65fdb98 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#12 0xb65ff312 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#13 0xa94af4f3 in TaskManager::TaskGroup::itemRemoved () from /usr/lib/libtaskmanager.so.4
#14 0xa94afc68 in TaskManager::TaskGroup::remove () from /usr/lib/libtaskmanager.so.4
#15 0xa949a740 in TaskManager::GroupManager::remove () from /usr/lib/libtaskmanager.so.4
#16 0xa949bc57 in TaskManager::GroupManager::qt_metacall () from /usr/lib/libtaskmanager.so.4
#17 0xb65fdb98 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#18 0xb65ff312 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#19 0xa94b2a73 in TaskManager::TaskManager::taskRemoved () from /usr/lib/libtaskmanager.so.4
#20 0xa94b41b7 in TaskManager::TaskManager::windowRemoved () from /usr/lib/libtaskmanager.so.4
#21 0xa94b6024 in TaskManager::TaskManager::qt_metacall () from /usr/lib/libtaskmanager.so.4
#22 0xb65fdb98 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#23 0xb65ff312 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#24 0xb77ffd13 in KWindowSystem::windowRemoved () from /usr/lib/libkdeui.so.5
#25 0xb780257c in ?? () from /usr/lib/libkdeui.so.5
#26 0xb7811953 in NETRootInfo::update () from /usr/lib/libkdeui.so.5
#27 0xb7811d3f in NETRootInfo::event () from /usr/lib/libkdeui.so.5
#28 0xb780283d in ?? () from /usr/lib/libkdeui.so.5
#29 0xb76bf9c9 in KApplication::x11EventFilter () from /usr/lib/libkdeui.so.5
#30 0xb7ee2557 in ?? () from /usr/lib/libkdeinit4_plasma.so
#31 0xb68cf6fe in ?? () from /usr/lib/libQtGui.so.4
#32 0xb68e1e78 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#33 0xb690cb7c in ?? () from /usr/lib/libQtGui.so.4
#34 0xb508b2d9 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#35 0xb508e85b in ?? () from /usr/lib/libglib-2.0.so.0
#36 0xb508e9d8 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#37 0xb66133a8 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#38 0xb690c245 in ?? () from /usr/lib/libQtGui.so.4
#39 0xb65e5e8a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#40 0xb65e62ca in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#41 0xb65e8759 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#42 0xb686c397 in QApplication::exec () from /usr/lib/libQtGui.so.4
#43 0xb7ed20d6 in kdemain () from /usr/lib/libkdeinit4_plasma.so
#44 0x08048742 in _start ()

kde4-config --version
-----------------------
Qt: 4.5.0-rc1
KDE: 4.2.00 (KDE 4.2.0) "release 83.1"
kde4-config: 1.0

By the way
------------------
since last night there is a problem with YaST2, because i can't update anymore. Somehow it looks to me like QT/KDE4.2 repo was not good yesterday. I always get:

YaST got signal 11 at YCP file /usr/share/YaST2/clients/online_update_select.ycp:83
/sbin/yast2: line 421: 12085 Speicherzugriffsfehler $ybindie/y2base $module "$@" "$SELECTED_GUI" $Y2_GEOMETRY $Y2UI_ARGS