Version:            (using KDE 4.2.1)
OS:                Linux
Installed from:    Ubuntu Packages

I got a crash.

This is what I was doing when it happened.
I used Appearance Settings, Desktop Settings, and installed a new Desktop Theme, Aya.
I clicked on the Apply button. 
Then I double-clicked on a plasmid in the panel, which was "System Monitor -CPU".
At that point I got the crash.

Here is data from the crash handler.

Application: Plasma Workspace (plasma), signal SIGSEGV
[Current thread is 0 (LWP 3698)]

Thread 3 (Thread 0xa85d4b90 (LWP 3702)):
#0  0xb7f45430 in __kernel_vsyscall ()
#1  0xb62807b1 in select () from /lib/tls/i686/cmov/libc.so.6
#2  0xb6554380 in ?? () from /usr/lib/libQtCore.so.4
#3  0xb648296e in ?? () from /usr/lib/libQtCore.so.4
#4  0xb50994ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#5  0xb628849e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread 0xa7dbdb90 (LWP 3704)):
#0  0xb7f45430 in __kernel_vsyscall ()
#1  0xb509d0e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb62972ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb64839b2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xb7904152 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0xb648296e in ?? () from /usr/lib/libQtCore.so.4
#6  0xb50994ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb628849e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb3e5b720 (LWP 3698)):
[KCrash Handler]
#6  0xb658d951 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#7  0xa87b40d3 in TaskManager::AbstractGroupingStrategy::groupRemoved () from /usr/lib/libtaskmanager.so.4
#8  0xa87b57d1 in TaskManager::AbstractGroupingStrategy::closeGroup () from /usr/lib/libtaskmanager.so.4
#9  0xa87bc597 in ?? () from /usr/lib/libtaskmanager.so.4
#10 0xa87bd23b in ?? () from /usr/lib/libtaskmanager.so.4
#11 0xb658cca8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#12 0xb658d932 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#13 0xa87cea63 in TaskManager::TaskGroup::itemRemoved () from /usr/lib/libtaskmanager.so.4
#14 0xa87cf0b0 in TaskManager::TaskGroup::remove () from /usr/lib/libtaskmanager.so.4
#15 0xa87b7f10 in TaskManager::GroupManager::remove () from /usr/lib/libtaskmanager.so.4
#16 0xa87b9c47 in TaskManager::GroupManager::qt_metacall () from /usr/lib/libtaskmanager.so.4
#17 0xb658cca8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#18 0xb658d932 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#19 0xa87d2483 in TaskManager::TaskManager::taskRemoved () from /usr/lib/libtaskmanager.so.4
#20 0xa87d3baf in TaskManager::TaskManager::windowRemoved () from /usr/lib/libtaskmanager.so.4
#21 0xa87d5a14 in TaskManager::TaskManager::qt_metacall () from /usr/lib/libtaskmanager.so.4
#22 0xb658cca8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#23 0xb658d932 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#24 0xb77c5473 in KWindowSystem::windowRemoved () from /usr/lib/libkdeui.so.5
#25 0xb77c7cf6 in ?? () from /usr/lib/libkdeui.so.5
#26 0xb77d71d3 in NETRootInfo::update () from /usr/lib/libkdeui.so.5
#27 0xb77d75bf in NETRootInfo::event () from /usr/lib/libkdeui.so.5
#28 0xb77c7f8d in ?? () from /usr/lib/libkdeui.so.5
#29 0xb767ac69 in KApplication::x11EventFilter () from /usr/lib/libkdeui.so.5
#30 0xb7f034d7 in ?? () from /usr/lib/libkdeinit4_plasma.so
#31 0xb6886f3e in ?? () from /usr/lib/libQtGui.so.4
#32 0xb68996a8 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#33 0xb68c5c6a in ?? () from /usr/lib/libQtGui.so.4
#34 0xb4e97b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#35 0xb4e9b0eb in ?? () from /usr/lib/libglib-2.0.so.0
#36 0xb4e9b268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#37 0xb65a2438 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#38 0xb68c5365 in ?? () from /usr/lib/libQtGui.so.4
#39 0xb657506a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#40 0xb65754aa in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#41 0xb6577959 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#42 0xb6823d17 in QApplication::exec () from /usr/lib/libQtGui.so.4
#43 0xb7ef0b56 in kdemain () from /usr/lib/libkdeinit4_plasma.so
#44 0x08048712 in _start ()