Version:           sconosciuto (using 4.1.2 (KDE 4.1.2), Kubuntu packages)
Compiler:          gcc
OS:                Linux (x86_64) release 2.6.24-21-generic

When i start a KDE4 session the first thing I am presented is a dialog saying that kded4 had crashed. Starting is from konsole doesn't work as well. I obtain the same following backtrace:

Applicazione: Demone KDE (kded4), segnale SIGABRT

[Thread debugging using libthread_db enabled]
[New Thread 0x7fe8ae64c6f0 (LWP 5918)]

[KCrash handler]
#5  0x00007fe8adf22095 in raise () from /lib/libc.so.6
#6  0x00007fe8adf23af0 in abort () from /lib/libc.so.6
#7  0x00007fe8acc89055 in qt_message_output () from /usr/lib/libQtCore.so.4
#8  0x00007fe8acc8919d in qFatal () from /usr/lib/libQtCore.so.4
#9  0x00007fe8a4264edd in ?? ()
   from /usr/lib/kde4/lib/kde4/kded_globalaccel.so
#10 0x00007fe8a42693e0 in ?? ()
   from /usr/lib/kde4/lib/kde4/kded_globalaccel.so
#11 0x00007fe8a426547d in ?? ()
   from /usr/lib/kde4/lib/kde4/kded_globalaccel.so
#12 0x00007fe8ac6d8243 in ?? () from /usr/lib/libQtDBus.so.4
#13 0x00007fe8ac6d93ff in ?? () from /usr/lib/libQtDBus.so.4
#14 0x00007fe8ac6d9d09 in ?? () from /usr/lib/libQtDBus.so.4
#15 0x00007fe8ac6d9e98 in ?? () from /usr/lib/libQtDBus.so.4
#16 0x00007fe8acd81497 in QObject::event () from /usr/lib/libQtCore.so.4
#17 0x00007fe8abd15acf in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#18 0x00007fe8abd17c85 in QApplication::notify () from /usr/lib/libQtGui.so.4
#19 0x00007fe8ad6891f1 in KApplication::notify ()
   from /usr/lib/kde4/lib/libkdeui.so.5
#20 0x00007fe8acd726b9 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#21 0x00007fe8acd739db in QCoreApplicationPrivate::sendPostedEvents ()
   from /usr/lib/libQtCore.so.4
#22 0x00007fe8acd9b6e3 in ?? () from /usr/lib/libQtCore.so.4
#23 0x00007fe8a8e13364 in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
#24 0x00007fe8a8e16675 in ?? () from /usr/lib/libglib-2.0.so.0
#25 0x00007fe8a8e16b5b in g_main_context_iteration ()
   from /usr/lib/libglib-2.0.so.0
#26 0x00007fe8acd9b9df in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#27 0x00007fe8abd9f20f in ?? () from /usr/lib/libQtGui.so.4
#28 0x00007fe8acd71b35 in QEventLoop::processEvents ()
   from /usr/lib/libQtCore.so.4
#29 0x00007fe8acd71c8b in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#30 0x00007fe8acd73cd9 in QCoreApplication::exec ()
   from /usr/lib/libQtCore.so.4
#31 0x00007fe8ae25ba21 in kdemain ()
   from /usr/lib/kde4/lib/libkdeinit4_kded4.so
#32 0x00007fe8adf0e1c4 in __libc_start_main () from /lib/libc.so.6
#33 0x0000000000400639 in _start ()
#0  0x00007fe8adf8db50 in nanosleep () from /lib/libc.so.6