Version:            (using KDE 4.1.2)
Installed from:    Ubuntu Packages

When I open systemsettings - Desktop - Screensaver, choose a screensaver and exit without save, systemsettings crash with the fatal error "The application Systemsettings crashed and caused the signal 11 (SIGSEGV).
The details are:

(no debugging symbols found) #repeated many times
[Thread debugging using libthread_db enabled]
[New Thread 0xb61bf6c0 (LWP 12904)]
[New Thread 0xb0a54b90 (LWP 12907)]
(no debugging symbols found) #repeated many times
[KCrash handler]
#6  0xb6e65210 in QWidgetPrivate::reparentFocusWidgets ()
   from /usr/lib/libQtGui.so.4
#7  0xb6e761b7 in QWidget::setParent () from /usr/lib/libQtGui.so.4
#8  0xb6e76a71 in QWidgetPrivate::init () from /usr/lib/libQtGui.so.4
#9  0xb6e772be in QWidget::QWidget () from /usr/lib/libQtGui.so.4
#10 0xb0cfab78 in ?? () from /usr/lib/kde4/kcm_screensaver.so
#11 0xb0ceba44 in ?? () from /usr/lib/kde4/kcm_screensaver.so
#12 0xb0cee2b4 in ?? () from /usr/lib/kde4/kcm_screensaver.so
#13 0xb7740a60 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#14 0xb77417e2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#15 0xb0cb4993 in K3Process::processExited ()
   from /usr/lib/libkde3support.so.4
#16 0xb0cb49df in K3Process::processHasExited ()
   from /usr/lib/libkde3support.so.4
#17 0xb0cb5784 in K3Process::wait () from /usr/lib/libkde3support.so.4
#18 0xb0ceabfc in ?? () from /usr/lib/kde4/kcm_screensaver.so
#19 0xb7db64cc in KCModuleProxy::deleteClient () from /usr/lib/libkutils.so.4
#20 0xb7db68b5 in KCModuleProxy::~KCModuleProxy ()
   from /usr/lib/libkutils.so.4
#21 0xb773a0ff in QObjectPrivate::deleteChildren ()
   from /usr/lib/libQtCore.so.4
#22 0xb6e74ff8 in QWidget::~QWidget () from /usr/lib/libQtGui.so.4
#23 0xb773a0ff in QObjectPrivate::deleteChildren ()
   from /usr/lib/libQtCore.so.4
#24 0xb6e75968 in QWidget::~QWidget () from /usr/lib/libQtGui.so.4
#25 0xb71ac261 in QFrame::~QFrame () from /usr/lib/libQtGui.so.4
#26 0xb72428cd in QAbstractScrollArea::~QAbstractScrollArea ()
   from /usr/lib/libQtGui.so.4
#27 0xb7248525 in QScrollArea::~QScrollArea () from /usr/lib/libQtGui.so.4
#28 0xb773a0ff in QObjectPrivate::deleteChildren ()
   from /usr/lib/libQtCore.so.4
#29 0xb6e75968 in QWidget::~QWidget () from /usr/lib/libQtGui.so.4
#30 0xb71ac261 in QFrame::~QFrame () from /usr/lib/libQtGui.so.4
#31 0xb7219651 in QStackedWidget::~QStackedWidget ()
   from /usr/lib/libQtGui.so.4
#32 0xb7c2e982 in ?? () from /usr/lib/libkdeui.so.5
#33 0xb773a0ff in QObjectPrivate::deleteChildren ()
   from /usr/lib/libQtCore.so.4
#34 0xb6e75968 in QWidget::~QWidget () from /usr/lib/libQtGui.so.4
#35 0xb7c2d690 in KPageView::~KPageView () from /usr/lib/libkdeui.so.5
#36 0xb7c32955 in KPageWidget::~KPageWidget () from /usr/lib/libkdeui.so.5
#37 0xb773a0ff in QObjectPrivate::deleteChildren ()
   from /usr/lib/libQtCore.so.4
#38 0xb6e75968 in QWidget::~QWidget () from /usr/lib/libQtGui.so.4
#39 0xb7288f26 in QDialog::~QDialog () from /usr/lib/libQtGui.so.4
#40 0xb7b5c2b4 in KDialog::~KDialog () from /usr/lib/libkdeui.so.5
#41 0xb7c2be41 in KPageDialog::~KPageDialog () from /usr/lib/libkdeui.so.5
#42 0x080545cd in _start ()
#0  0xb8090430 in __kernel_vsyscall ()