Version:            (using KDE 4.1.3)
OS:                Linux
Installed from:    Mandriva RPMs

Certain OpenGL screen savers such as euphoria (regular) caused a signal 11 (SIGSEGV) fatal error.  Also when the screen saver kicks in it is limited to the upper left quarter of the screen with the remaining 3/4 having a white background.
Additioally, the Compiz Fusion cube rotation feature stopped working correctly.  Dragging a window to a different desktop would give the visual effect of the cube rotation but the application window would remain on dektop 1. Clicking on the 4 different desktop icons in the taskbar would switch to a different desktop without the cube rotation visual but sometimes would turn that desktop blank.
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Backtrace Results
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Application: System Settings (systemsettings), signal SIGSEGV
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[Thread debugging using libthread_db enabled]
[New Thread 0xb5f4aaf0 (LWP 26033)]
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[KCrash handler]
#6  0xb6c8e92b in QWidgetPrivate::reparentFocusWidgets ()
   from /usr/lib/libQtGui.so.4
#7  0xb6ca0197 in QWidget::setParent () from /usr/lib/libQtGui.so.4
#8  0xb6ca0a8b in QWidgetPrivate::init () from /usr/lib/libQtGui.so.4
#9  0xb6ca1337 in QWidget::QWidget () from /usr/lib/libQtGui.so.4
#10 0xb31777fa in ?? () from /usr/lib/kde4/kcm_screensaver.so
#11 0xb3168e39 in ?? () from /usr/lib/kde4/kcm_screensaver.so
#12 0xb316b465 in ?? () from /usr/lib/kde4/kcm_screensaver.so
#13 0xb75a5c8d in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#14 0xb75a6a95 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#15 0xb2b44e25 in K3Process::processExited ()
   from /usr/lib/libkde3support.so.4
#16 0xb2b44e70 in K3Process::processHasExited ()
   from /usr/lib/libkde3support.so.4
#17 0xb2b45ee7 in K3Process::wait () from /usr/lib/libkde3support.so.4
#18 0xb3168dae in ?? () from /usr/lib/kde4/kcm_screensaver.so
#19 0xb7c4b11c in KCModuleProxy::deleteClient () from /usr/lib/libkutils.so.4
#20 0xb7c4bbb4 in KCModuleProxy::~KCModuleProxy ()
   from /usr/lib/libkutils.so.4
#21 0xb759f084 in QObjectPrivate::deleteChildren ()
   from /usr/lib/libQtCore.so.4
#22 0xb6c9efc4 in QWidget::~QWidget () from /usr/lib/libQtGui.so.4
#23 0xb759f084 in QObjectPrivate::deleteChildren ()
   from /usr/lib/libQtCore.so.4
#24 0xb6c9f414 in QWidget::~QWidget () from /usr/lib/libQtGui.so.4
#25 0xb6ff1ccf in QFrame::~QFrame () from /usr/lib/libQtGui.so.4
#26 0xb708c14e in QAbstractScrollArea::~QAbstractScrollArea ()
   from /usr/lib/libQtGui.so.4
#27 0xb7091fe5 in QScrollArea::~QScrollArea () from /usr/lib/libQtGui.so.4
#28 0xb759f084 in QObjectPrivate::deleteChildren ()
   from /usr/lib/libQtCore.so.4
#29 0xb6c9f414 in QWidget::~QWidget () from /usr/lib/libQtGui.so.4
#30 0xb6ff1ccf in QFrame::~QFrame () from /usr/lib/libQtGui.so.4
#31 0xb7061a8f in QStackedWidget::~QStackedWidget ()
   from /usr/lib/libQtGui.so.4
#32 0xb7a8b3d2 in ?? () from /usr/lib/libkdeui.so.5
#33 0xb759f084 in QObjectPrivate::deleteChildren ()
   from /usr/lib/libQtCore.so.4
#34 0xb6c9f414 in QWidget::~QWidget () from /usr/lib/libQtGui.so.4
#35 0xb7a8a070 in KPageView::~KPageView () from /usr/lib/libkdeui.so.5
#36 0xb7a8f4f5 in KPageWidget::~KPageWidget () from /usr/lib/libkdeui.so.5
#37 0xb759f084 in QObjectPrivate::deleteChildren ()
   from /usr/lib/libQtCore.so.4
#38 0xb6c9f414 in QWidget::~QWidget () from /usr/lib/libQtGui.so.4
#39 0xb70d4ac7 in QDialog::~QDialog () from /usr/lib/libQtGui.so.4
#40 0xb79bf914 in KDialog::~KDialog () from /usr/lib/libkdeui.so.5
#41 0xb7a887cf in KPageDialog::~KPageDialog () from /usr/lib/libkdeui.so.5
#42 0x0805327b in _start ()
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Hope This helps