Version:            (using KDE 4.2.2)
Installed from:    Ubuntu Packages

I closed the add widgets window without adding anything. the screen flashed and the crash detected window came up. I was running firefox and dolphin as well.

Application: Plasma Workspace (plasma), signal SIGSEGV
0x00007fb016db1d21 in nanosleep () from /lib/libc.so.6
[Current thread is 0 (LWP 4694)]

Thread 4 (Thread 0x7faffbefe950 (LWP 4695)):
#0  0x00007fb0142772e9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fb017893939 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2  0x00007fb01b04f4cc in ?? () from /usr/lib/libQtNetwork.so.4
#3  0x00007fb017892952 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007fb0142733ba in start_thread () from /lib/libpthread.so.0
#5  0x00007fb016deffcd in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7faffac24950 (LWP 4696)):
#0  0x00007fb016de8742 in select () from /lib/libc.so.6
#1  0x00007fb017959f06 in ?? () from /usr/lib/libQtCore.so.4
#2  0x00007fb017892952 in ?? () from /usr/lib/libQtCore.so.4
#3  0x00007fb0142733ba in start_thread () from /lib/libpthread.so.0
#4  0x00007fb016deffcd in clone () from /lib/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7faffa423950 (LWP 4698)):
#0  0x00007fb0142772e9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fb017893939 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2  0x00007faffd276d4e in ?? () from /usr/lib/kde4/plasma_wallpaper_image.so
#3  0x00007fb017892952 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007fb0142733ba in start_thread () from /lib/libpthread.so.0
#5  0x00007fb016deffcd in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fb01c401790 (LWP 4694)):
[KCrash Handler]
#5  0x00007fb01799560c in ?? () from /usr/lib/libQtCore.so.4
#6  0x00007fb01799493a in QSignalMapper::map () from /usr/lib/libQtCore.so.4
#7  0x00007fb0179954b0 in QSignalMapper::qt_metacall () from /usr/lib/libQtCore.so.4
#8  0x00007fb0179911f2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#9  0x00007fb0180ba897 in QAction::triggered () from /usr/lib/libQtGui.so.4
#10 0x00007fb0180bbd10 in QAction::activate () from /usr/lib/libQtGui.so.4
#11 0x00007fb0184e9d1c in ?? () from /usr/lib/libQtGui.so.4
#12 0x00007fb0184efcee in ?? () from /usr/lib/libQtGui.so.4
#13 0x00007fb01a84eb71 in KMenu::mouseReleaseEvent () from /usr/lib/libkdeui.so.5
#14 0x00007fb01811197f in QWidget::event () from /usr/lib/libQtGui.so.4
#15 0x00007fb0184f24ab in QMenu::event () from /usr/lib/libQtGui.so.4
#16 0x00007fb0180c083d in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#17 0x00007fb0180c918a in QApplication::notify () from /usr/lib/libQtGui.so.4
#18 0x00007fb01a77d26b in KApplication::notify () from /usr/lib/libkdeui.so.5
#19 0x00007fb01797b75c in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#20 0x00007fb0180c83d8 in QApplicationPrivate::sendMouseEvent () from /usr/lib/libQtGui.so.4
#21 0x00007fb018132084 in ?? () from /usr/lib/libQtGui.so.4
#22 0x00007fb018130b38 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#23 0x00007fb018159514 in ?? () from /usr/lib/libQtGui.so.4
#24 0x00007fb01264320a in IA__g_main_context_dispatch (context=0x1634120) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:1814
#25 0x00007fb0126468e0 in g_main_context_iterate (context=0x1634120, block=1, dispatch=1, self=<value optimized out>) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2448
#26 0x00007fb012646a7c in IA__g_main_context_iteration (context=0x1634120, may_block=1) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2511
#27 0x00007fb0179a4e6f in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#28 0x00007fb018158c9f in ?? () from /usr/lib/libQtGui.so.4
#29 0x00007fb01797a002 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#30 0x00007fb01797a3cd in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#31 0x00007fb0184f2305 in QMenu::exec () from /usr/lib/libQtGui.so.4
#32 0x00007fb0184fd65c in ?? () from /usr/lib/libQtGui.so.4
#33 0x00007fb0184feccd in QPushButton::qt_metacall () from /usr/lib/libQtGui.so.4
#34 0x00007fb01a85a2d5 in KPushButton::qt_metacall () from /usr/lib/libkdeui.so.5
#35 0x00007fb0179911f2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#36 0x00007fb018462c9e in ?? () from /usr/lib/libQtGui.so.4
#37 0x00007fb018462e73 in QAbstractButton::mousePressEvent () from /usr/lib/libQtGui.so.4
#38 0x00007fb018111b56 in QWidget::event () from /usr/lib/libQtGui.so.4
#39 0x00007fb0180c083d in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#40 0x00007fb0180c918a in QApplication::notify () from /usr/lib/libQtGui.so.4
#41 0x00007fb01a77d26b in KApplication::notify () from /usr/lib/libkdeui.so.5
#42 0x00007fb01797b75c in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#43 0x00007fb0180c83d8 in QApplicationPrivate::sendMouseEvent () from /usr/lib/libQtGui.so.4
#44 0x00007fb018131ec9 in ?? () from /usr/lib/libQtGui.so.4
#45 0x00007fb018130b38 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#46 0x00007fb018159514 in ?? () from /usr/lib/libQtGui.so.4
#47 0x00007fb01264320a in IA__g_main_context_dispatch (context=0x1634120) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:1814
#48 0x00007fb0126468e0 in g_main_context_iterate (context=0x1634120, block=1, dispatch=1, self=<value optimized out>) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2448
#49 0x00007fb012646a7c in IA__g_main_context_iteration (context=0x1634120, may_block=1) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2511
#50 0x00007fb0179a4e6f in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#51 0x00007fb018158c9f in ?? () from /usr/lib/libQtGui.so.4
#52 0x00007fb01797a002 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#53 0x00007fb01797a3cd in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#54 0x00007fb01797c694 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#55 0x00007fb01c0dc9bb in kdemain () from /usr/lib/libkdeinit4_plasma.so
#56 0x00007fb016d285a6 in __libc_start_main () from /lib/libc.so.6
#57 0x00000000004007c9 in _start ()