After my upgrade , am getting various crashes / segmentation fault in various KDE utilities eg KDEd4 , Knotify, KMinit??,
are there any simple diagnostic procedures I can find the cause of these problems?
KDE does start and my MythTV application does run but programs like Firefox and Dolphin crash all the time, so I guess its something in my KDE setup or Xorg causing this but I don't know how to resolve this.

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[20112.448895] kded4[4008]: segfault at 70fd4815 ip 4e45950c sp bf93de00 error 6 in ld-2.15.so[4e44d000+1f000]

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Application: KNotify (knotify4), signal: Segmentation fault
Using host libthread_db library "/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0xb77387c0 (LWP 13337))]

Thread 2 (Thread 0xb629cb40 (LWP 13342)):
#0  0xb7773424 in __kernel_vsyscall ()
#1  0x4e66918b in read () from /lib/libpthread.so.0
#2  0x4e8e44e6 in ?? () from /lib/libglib-2.0.so.0
#3  0x4e8a3df2 in g_main_context_check () from /lib/libglib-2.0.so.0
#4  0x4e8a4272 in ?? () from /lib/libglib-2.0.so.0
#5  0x4e8a4442 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#6  0x4f4cfcbf in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#7  0x4f49c08d in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#8  0x4f49c389 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#9  0x4f385e1c in QThread::exec() () from /lib/libQtCore.so.4
#10 0x4f47a26e in ?? () from /lib/libQtCore.so.4
#11 0x4f389261 in ?? () from /lib/libQtCore.so.4
#12 0x4e662adf in start_thread () from /lib/libpthread.so.0
#13 0x4e5683ce in clone () from /lib/libc.so.6


Thanks
Paul

Please check that all KDE packages are up to date, the crashes may be due from leftovers from your upgrade.

all my packages appear to be FC17

eg

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[root@mythbox ~]# grep kde /var/log/rpmpkgs
beefy-miracle-backgrounds-kde-16.91.0-2.fc17.noarch.rpm
beefy-miracle-kde-theme-16.91.0.1-1.fc17.noarch.rpm
constantine-backgrounds-kde-12.1.1-5.fc17.noarch.rpm
constantine-kde-theme-12.1.0-4.fc17.noarch.rpm
goddard-backgrounds-kde-13.0.0-4.fc17.noarch.rpm
goddard-kde-theme-13.1.0-3.fc17.noarch.rpm
kde-baseapps-4.8.5-1.fc17.i686.rpm
kde-baseapps-libs-4.8.5-1.fc17.i686.rpm
kde-filesystem-4-39.fc17.i686.rpm
kde-printer-applet-4.8.5-1.fc17.noarch.rpm
kde-runtime-4.8.5-1.fc17.i686.rpm
kde-runtime-flags-4.8.5-1.fc17.noarch.rpm
kde-runtime-libs-4.8.5-1.fc17.i686.rpm
kde-settings-4.8-18.fc17.noarch.rpm
kde-settings-kdm-4.8-18.fc17.noarch.rpm
kde-settings-ksplash-4.8-18.fc17.noarch.rpm
kde-settings-plasma-4.8-18.fc17.noarch.rpm
kde-settings-pulseaudio-4.8-18.fc17.noarch.rpm
kde-style-phase-4.8.5-1.fc17.i686.rpm
kde-wallpapers-4.8.5-1.fc17.noarch.rpm
kde-workspace-4.8.5-2.fc17.i686.rpm
kde-workspace-libs-4.8.5-2.fc17.i686.rpm
kdeadmin-4.8.4-1.fc17.i686.rpm
kdeartwork-4.8.5-1.fc17.i686.rpm
kdeartwork-sounds-4.8.5-1.fc17.noarch.rpm
kdeartwork-wallpapers-4.8.5-1.fc17.noarch.rpm
kdegraphics-4.8.5-1.fc17.noarch.rpm
kdegraphics-libs-4.8.5-1.fc17.noarch.rpm
kdegraphics-mobipocket-4.8.5-1.fc17.i686.rpm
kdegraphics-strigi-analyzer-4.8.5-1.fc17.i686.rpm
kdegraphics-thumbnailers-4.8.5-1.fc17.i686.rpm
kdelibs-4.8.5-1.fc17.i686.rpm
kdelibs-common-4.8.5-1.fc17.i686.rpm
kdelibs3-3.5.10-37.fc17.i686.rpm
kdemultimedia-4.8.5-1.fc17.i686.rpm
kdemultimedia-common-4.8.5-1.fc17.noarch.rpm
kdemultimedia-dragonplayer-4.8.5-1.fc17.i686.rpm
kdemultimedia-juk-4.8.5-1.fc17.i686.rpm
kdemultimedia-kio_audiocd-4.8.5-1.fc17.i686.rpm
kdemultimedia-kmix-4.8.5-1.fc17.i686.rpm
kdemultimedia-kscd-4.8.5-1.fc17.i686.rpm
kdemultimedia-libs-4.8.5-1.fc17.i686.rpm
kdenetwork-4.8.5-1.fc17.i686.rpm
kdenetwork-common-4.8.5-1.fc17.noarch.rpm
kdenetwork-fileshare-samba-4.8.5-1.fc17.i686.rpm
kdenetwork-kdnssd-4.8.5-1.fc17.i686.rpm
kdenetwork-kget-4.8.5-1.fc17.i686.rpm
kdenetwork-kget-libs-4.8.5-1.fc17.i686.rpm
kdenetwork-kopete-4.8.5-1.fc17.i686.rpm
kdenetwork-kopete-libs-4.8.5-1.fc17.i686.rpm
kdenetwork-kppp-4.8.5-1.fc17.i686.rpm
kdenetwork-krdc-4.8.5-1.fc17.i686.rpm
kdenetwork-krdc-libs-4.8.5-1.fc17.i686.rpm
kdenetwork-krfb-4.8.5-1.fc17.i686.rpm
kdenetwork-krfb-libs-4.8.5-1.fc17.i686.rpm
kdepim-4.8.5-2.fc17.i686.rpm
kdepim-libs-4.8.5-2.fc17.i686.rpm
kdepim-runtime-4.8.5-1.fc17.i686.rpm
kdepim-runtime-libs-4.8.5-1.fc17.i686.rpm
kdepimlibs-4.8.5-1.fc17.i686.rpm
kdepimlibs-akonadi-4.8.5-1.fc17.i686.rpm
kdeplasma-addons-4.8.5-1.fc17.i686.rpm
kdeplasma-addons-libs-4.8.5-1.fc17.i686.rpm
kdesdk-4.8.5-1.fc17.i686.rpm
kdesdk-cervisia-4.8.5-1.fc17.i686.rpm
kdesdk-common-4.8.5-1.fc17.noarch.rpm
kdesdk-dolphin-plugins-4.8.5-1.fc17.i686.rpm
kdesdk-kapptemplate-4.8.5-1.fc17.i686.rpm
kdesdk-kcachegrind-4.8.5-1.fc17.i686.rpm
kdesdk-kioslave-4.8.5-1.fc17.i686.rpm
kdesdk-kmtrace-4.8.5-1.fc17.i686.rpm
kdesdk-kmtrace-libs-4.8.5-1.fc17.i686.rpm
kdesdk-kompare-4.8.5-1.fc17.i686.rpm
kdesdk-kompare-libs-4.8.5-1.fc17.i686.rpm
kdesdk-kpartloader-4.8.5-1.fc17.i686.rpm
kdesdk-kstartperf-4.8.5-1.fc17.i686.rpm
kdesdk-kuiviewer-4.8.5-1.fc17.i686.rpm
kdesdk-okteta-4.8.5-1.fc17.i686.rpm
kdesdk-okteta-libs-4.8.5-1.fc17.i686.rpm
kdesdk-poxml-4.8.5-1.fc17.i686.rpm
kdesdk-scripts-4.8.5-1.fc17.noarch.rpm
kdesdk-strigi-analyzer-4.8.5-1.fc17.i686.rpm
kdesdk-umbrello-4.8.5-1.fc17.i686.rpm
kdeutils-4.8.5-1.fc17.noarch.rpm
kdeutils-minimal-4.8.5-1.fc17.noarch.rpm
kdewebdev-libs-3.5.10-14.fc17.i686.rpm
leonidas-kde-theme-11.0.3-3.fc17.noarch.rpm
lockdev-1.0.4-0.4.20111007git.fc17.i686.rpm
lockdev-devel-1.0.4-0.4.20111007git.fc17.i686.rpm
lovelock-backgrounds-kde-14.91.1-2.fc17.noarch.rpm
lovelock-kde-theme-14.91.0-3.fc17.noarch.rpm
polkit-kde-0.99.0-4.fc17.i686.rpm
pykde4-4.8.5-1.fc17.i686.rpm
smokekde-4.8.5-1.fc17.i686.rpm
solar-kde-theme-0.1.19-3.fc17.noarch.rpm



I just came across this bug https://bugzilla.redhat.com/show_bug.cgi?id=737223

a prelink maybe required ?

PLease try the solution outlined in the last post of the report thread, and then report back.