Version:           0.50.1 (using KDE 4.0.2)
Installed from:    SuSE RPMs
OS:                Linux

When saving behavior settings after editing them, Kopete crashes (Signal 11 )with the following output:

--------
[starting kopete]
user@host:~> kopete
QDateTime::fromString: Parameter out of range
[...]
QDateTime::fromString: Parameter out of range
kopete(10119)/libkopete Kopete::PluginManager::loadPluginInternal: Unable tofind a plugin named ' "" '!

[saving settings]
user@host:~> KCrash: Application 'kopete' crashing...
sock_file=/home/user/.kde4/socket-host/kdeinit4__0
--------




Backtrace:
--------
[?1034h(no debugging symbols found)
Using host libthread_db library "/lib64/libthread_db.so.1".
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 0x2b0ff791f760 (LWP 10146)]
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[KCrash handler]
#5  0x00002b0fec84497b in KPluginInfo::pluginName ()
   from /usr/lib64/libkdecore.so.5
#6  0x00002aaaac69e3fb in ?? ()
   from /usr/lib64/kde4/kcm_kopete_behaviorconfig.so
#7  0x00002b0fef399837 in KCModuleProxy::save () from /usr/lib64/libkutils.so.4
#8  0x00002b0fef395d02 in ?? () from /usr/lib64/libkutils.so.4
#9  0x00002b0fef39779a in KCMultiDialog::qt_metacall ()
   from /usr/lib64/libkutils.so.4
#10 0x00002b0fef3b1c95 in KSettings::Dialog::qt_metacall ()
   from /usr/lib64/libkutils.so.4
#11 0x00002b0fec25e0de in QMetaObject::activate ()
   from /usr/lib64/libQtCore.so.4
#12 0x00002b0fed38413a in KDialog::slotButtonClicked ()
   from /usr/lib64/libkdeui.so.5
#13 0x00002b0fed384618 in KDialog::qt_metacall () from /usr/lib64/libkdeui.so.5
#14 0x00002b0fed420ec6 in KPageDialog::qt_metacall ()
   from /usr/lib64/libkdeui.so.5
#15 0x00002b0fef397715 in KCMultiDialog::qt_metacall ()
   from /usr/lib64/libkutils.so.4
#16 0x00002b0fef3b1c95 in KSettings::Dialog::qt_metacall ()
   from /usr/lib64/libkutils.so.4
#17 0x00002b0fec25e0de in QMetaObject::activate ()
   from /usr/lib64/libQtCore.so.4
#18 0x00002b0fec2612ee in QSignalMapper::mapped ()
   from /usr/lib64/libQtCore.so.4
#19 0x00002b0fec2619ca in QSignalMapper::map () from /usr/lib64/libQtCore.so.4
#20 0x00002b0fec261bfc in QSignalMapper::qt_metacall ()
   from /usr/lib64/libQtCore.so.4
#21 0x00002b0fec25e0de in QMetaObject::activate ()
   from /usr/lib64/libQtCore.so.4
#22 0x00002b0fee25f877 in QAbstractButton::clicked ()
   from /usr/lib64/libQtGui.so.4
#23 0x00002b0fee07858b in QAbstractButtonPrivate::emitClicked ()
   from /usr/lib64/libQtGui.so.4
#24 0x00002b0fee079845 in QAbstractButtonPrivate::click ()
   from /usr/lib64/libQtGui.so.4
#25 0x00002b0fee079a41 in QAbstractButton::mouseReleaseEvent ()
   from /usr/lib64/libQtGui.so.4
#26 0x00002b0fede25623 in QWidget::event () from /usr/lib64/libQtGui.so.4
#27 0x00002b0fee078b60 in QAbstractButton::event ()
   from /usr/lib64/libQtGui.so.4
#28 0x00002b0fee0f5258 in QPushButton::event () from /usr/lib64/libQtGui.so.4
#29 0x00002b0fedde5b5b in QApplicationPrivate::notify_helper ()
   from /usr/lib64/libQtGui.so.4
#30 0x00002b0fedde736d in QApplication::notify () from /usr/lib64/libQtGui.so.4
#31 0x00002b0fed3f8f5b in KApplication::notify () from /usr/lib64/libkdeui.so.5
#32 0x00002b0fec24ce20 in QCoreApplication::notifyInternal ()
   from /usr/lib64/libQtCore.so.4
#33 0x00002b0fede35e13 in QETWidget::translateMouseEvent ()
   from /usr/lib64/libQtGui.so.4
#34 0x00002b0fede34e91 in QApplication::x11ProcessEvent ()
   from /usr/lib64/libQtGui.so.4
#35 0x00002b0fede566a3 in ?? () from /usr/lib64/libQtGui.so.4
#36 0x00002b0ff53c1064 in g_main_context_dispatch ()
   from /usr/lib64/libglib-2.0.so.0
#37 0x00002b0ff53c435d in ?? () from /usr/lib64/libglib-2.0.so.0
#38 0x00002b0ff53c482e in g_main_context_iteration ()
   from /usr/lib64/libglib-2.0.so.0
#39 0x00002b0fec26c341 in QEventDispatcherGlib::processEvents ()
   from /usr/lib64/libQtCore.so.4
#40 0x00002b0fede562bf in QGuiEventDispatcherGlib::processEvents ()
   from /usr/lib64/libQtGui.so.4
#41 0x00002b0fec24c5c0 in QEventLoop::processEvents ()
   from /usr/lib64/libQtCore.so.4
#42 0x00002b0fec24c6dd in QEventLoop::exec () from /usr/lib64/libQtCore.so.4
#43 0x00002b0fec24e637 in QCoreApplication::exec ()
   from /usr/lib64/libQtCore.so.4
#44 0x0000000000446497 in _start ()
#0  0x00002b0ff4cd19a1 in nanosleep () from /lib64/libc.so.6
--------


The same bug was reported here: https://bugs.launchpad.net/ubuntu/+source/kdenetwork-kde4/+bug/199984 but without any answers.