Version:            (using KDE 4.2.0)
Compiler:          gcc (Ubuntu 4.3.2) 
OS:                Linux
Installed from:    Ubuntu Packages

The KDE Crash Handler appears as soon as I log on KDE 4.2 (no problems with 4.1) with the following details:

Application: KDE Daemon (kded4), signal SIGABRT
0x00007fa99aec45f0 in __nanosleep_nocancel () from /lib/libc.so.6

Thread 1 (Thread 0x7fa99f56f6f0 (LWP 6370)):
[KCrash Handler]
#5  0x00007fa99ae4efd5 in raise () from /lib/libc.so.6
#6  0x00007fa99ae50b43 in abort () from /lib/libc.so.6
#7  0x00007fa99c8f66b5 in qt_message_output () from /usr/lib/libQtCore.so.4
#8  0x00007fa99c8f67fd in qFatal () from /usr/lib/libQtCore.so.4
#9  0x00007fa992993953 in ?? () from /usr/lib/kde4/kded_phononserver.so
#10 0x00007fa992993cb8 in ?? () from /usr/lib/kde4/kded_phononserver.so
#11 0x00007fa99299483a in ?? () from /usr/lib/kde4/kded_phononserver.so
#12 0x00007fa99299068d in ?? () from /usr/lib/kde4/kded_phononserver.so
#13 0x00007fa9929871eb in ?? () from /usr/lib/kde4/kded_phononserver.so
#14 0x00007fa99298ab38 in ?? () from /usr/lib/kde4/kded_phononserver.so
#15 0x00007fa99298fe6c in KPluginFactory::createInstance<PhononServer, QObject> () from /usr/lib/kde4/kded_phononserver.so
#16 0x00007fa99d12c64d in KPluginFactory::create (this=0x1ce90c0, iface=0x7fa99d170240 "KDEDModule", parentWidget=0x0, parent=0x1c85250, args=@0x7fffa75a1d60, keyword=@0x7fffa75a1d30)
    at /build/buildd/kde4libs-4.2.0/kdecore/util/kpluginfactory.cpp:191
#17 0x00007fa99f179d00 in Kded::loadModule (this=0x1c85250, s=@0x7fffa75a1eb0, onDemand=<value optimized out>) at /build/buildd/kde4libs-4.2.0/kdecore/util/kpluginfactory.h:491
#18 0x00007fa99f17a37d in Kded::loadModule (this=0x1c85250, obj=<value optimized out>, onDemand=6) at /build/buildd/kde4libs-4.2.0/kded/kded.cpp:334
#19 0x00007fa99f17aacd in Kded::messageFilter (message=<value optimized out>) at /build/buildd/kde4libs-4.2.0/kded/kded.cpp:195
#20 0x00007fa99ccf73eb in ?? () from /usr/lib/libQtDBus.so.4
#21 0x00007fa99ccf78bc in ?? () from /usr/lib/libQtDBus.so.4
#22 0x00007fa996a1990b in dbus_connection_dispatch () from /lib/libdbus-1.so.3
#23 0x00007fa99ccea597 in ?? () from /usr/lib/libQtDBus.so.4
#24 0x00007fa99ccebbb8 in ?? () from /usr/lib/libQtDBus.so.4
#25 0x00007fa99cd28bd6 in ?? () from /usr/lib/libQtDBus.so.4
#26 0x00007fa99c9fb134 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#27 0x00007fa99ca317de in QSocketNotifier::activated () from /usr/lib/libQtCore.so.4
#28 0x00007fa99ca00c43 in QSocketNotifier::event () from /usr/lib/libQtCore.so.4
#29 0x00007fa99d580c3d in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#30 0x00007fa99d5889ba in QApplication::notify () from /usr/lib/libQtGui.so.4
#31 0x00007fa99e8b73eb in KApplication::notify (this=0x7fffa75a2c30, receiver=0x1dbb490, event=0x7fffa75a2910) at /build/buildd/kde4libs-4.2.0/kdeui/kernel/kapplication.cpp:307
#32 0x00007fa99c9e6d61 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#33 0x00007fa99ca0f3d9 in ?? () from /usr/lib/libQtCore.so.4
#34 0x00007fa998fbfd3b in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#35 0x00007fa998fc350d in ?? () from /usr/lib/libglib-2.0.so.0
#36 0x00007fa998fc36cb in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#37 0x00007fa99ca0f15f in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#38 0x00007fa99d612a6f in ?? () from /usr/lib/libQtGui.so.4
#39 0x00007fa99c9e5682 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#40 0x00007fa99c9e580d in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#41 0x00007fa99c9e7cbd in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#42 0x00007fa99f17d479 in kdemain (argc=1, argv=0x7fffa75a2fe8) at /build/buildd/kde4libs-4.2.0/kded/kded.cpp:938
#43 0x00007fa99ae3a466 in __libc_start_main () from /lib/libc.so.6
#44 0x0000000000400759 in _start ()