Version:           4.0.1 (using KDE 4.0.0)
Installed from:    Debian testing/unstable Packages

It just crashes. Hope this backtrace helps:

Using host libthread_db library "/lib/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread 0x2b63fd40cd80 (LWP 8514)]
[KCrash handler]
#5  0x00002b63f5cf20ef in QObject::connect (sender=0x112b7f0, 
    signal=<value optimized out>, receiver=0x10f5820, 
    method=0x2b6408502a6f "1changedSlot()", type=Qt::AutoConnection)
    at kernel/qobject.cpp:2516
#6  0x00002b6408495bc7 in KcmSambaConf::loadBaseSettings (this=0x1018440, 
    share=0x107b3f0)
    at /tmp/buildd/kdenetwork-4.0.1/filesharing/advanced/kcm_sambaconf/kcmsambaconf.cpp:606
#7  0x00002b6408496498 in KcmSambaConf::fillFields (this=0x1018440)
    at /tmp/buildd/kdenetwork-4.0.1/filesharing/advanced/kcm_sambaconf/kcmsambaconf.cpp:568
#8  0x00002b6408496791 in KcmSambaConf::qt_metacall (this=0x1018440, 
    _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, 
    _a=0x7fffb50de650)
    at /tmp/buildd/kdenetwork-4.0.1/obj-x86_64-linux-gnu/filesharing/advanced/kcm_sambaconf/kcmsambaconf.moc:100
#9  0x00002b63f5cf0271 in QMetaObject::activate (sender=0x109fb10, 
    from_signal_index=5, to_signal_index=5, argv=0x2b63f5d46720)
    at kernel/qobject.cpp:3087
#10 0x00002b640849a6ed in SambaFile::load (this=0x109fb10)
    at /tmp/buildd/kdenetwork-4.0.1/filesharing/advanced/kcm_sambaconf/sambafile.cpp:501
#11 0x00002b6408494cb0 in KcmSambaConf::load (this=0x1018440, 
    smbFile=@0x7fffb50de7f0)
    at /tmp/buildd/kdenetwork-4.0.1/filesharing/advanced/kcm_sambaconf/kcmsambaconf.cpp:524
#12 0x00002b6408494e2a in KcmSambaConf::slotSpecifySmbConf (this=0x1018440, 
    smbConf=@0x2b6408503e13)
    at /tmp/buildd/kdenetwork-4.0.1/filesharing/advanced/kcm_sambaconf/kcmsambaconf.cpp:224
#13 0x00002b6408494f4e in KcmSambaConf (this=0x1018440, 
    inst=<value optimized out>, parent=<value optimized out>, 
    name=<value optimized out>)
    at /tmp/buildd/kdenetwork-4.0.1/filesharing/advanced/kcm_sambaconf/kcmsambaconf.cpp:202
#14 0x00002b6408495047 in create_KcmSambaConf (parent=0x1015fe0, 
    name=0xbf1e58 "KcmSambaConf")
    at /tmp/buildd/kdenetwork-4.0.1/filesharing/advanced/kcm_sambaconf/kcmsambaconf.cpp:1450
#15 0x00002b63f699c529 in KCModuleLoader::loadModule (mod=@0x1017d90, 
    report=KCModuleLoader::Inline, parent=0x1015fe0, 
    args=<value optimized out>)
    at /tmp/buildd/kde4libs-4.0.1/kutils/kcmoduleloader.cpp:112
#16 0x00002b63f69a1905 in KCModuleProxyPrivate::loadModule (this=0x1017d60)
    at /tmp/buildd/kde4libs-4.0.1/kutils/kcmoduleproxy.cpp:107
#17 0x00002b63f69a2935 in KCModuleProxy::realModule (
    this=<value optimized out>)
    at /tmp/buildd/kde4libs-4.0.1/kutils/kcmoduleproxy.cpp:83
#18 0x00002b63f69a2a3c in KCModuleProxy::buttons (this=0x2b6408503e13)
    at /tmp/buildd/kde4libs-4.0.1/kutils/kcmoduleproxy.cpp:300
#19 0x0000000000416807 in KCMultiWidget::addModule (this=0xfe5b10, 
    moduleinfo=@0x7bbeb0)
    at /tmp/buildd/kdebase-workspace-4.0.1/systemsettings/kcmultiwidget.cpp:257
#20 0x000000000041b0a1 in MainWindow::selectionChanged (this=0x744e20, 
    selected=<value optimized out>)
    at /tmp/buildd/kdebase-workspace-4.0.1/systemsettings/mainwindow.cpp:373
#21 0x000000000041b193 in MainWindow::qt_metacall (this=0x744e20, 
    _c=QMetaObject::InvokeMetaMethod, _id=17993216, _a=0x7fffb50dfaf0)
    at /tmp/buildd/kdebase-workspace-4.0.1/obj-x86_64-linux-gnu/systemsettings/mainwindow.moc:80
#22 0x00002b63f5cf0271 in QMetaObject::activate (sender=0x949320, 
    from_signal_index=32, to_signal_index=32, argv=0x2b63f5d46720)
    at kernel/qobject.cpp:3087
#23 0x00002b63f7159755 in QAbstractItemView::clicked (this=0x112b7f0, 
    _t1=<value optimized out>)
    at .moc/debug-shared/moc_qabstractitemview.cpp:309
#24 0x00002b63f7164c33 in QAbstractItemView::mouseReleaseEvent (
    this=0x949320, event=0x7fffb50e0940)
    at itemviews/qabstractitemview.cpp:1547
#25 0x00002b63f7178987 in QListView::mouseReleaseEvent (this=0x112b7f0, 
    e=0x2b6408503e13) at itemviews/qlistview.cpp:800
#26 0x000000000042365c in KCategorizedView::mouseReleaseEvent (
    this=0x112b7f0, event=0x2b6408503e13)
    at /tmp/buildd/kdebase-workspace-4.0.1/systemsettings/kcategorizedview.cpp:1086
#27 0x00002b63f6db4d32 in QWidget::event (this=0x949320, event=0x7fffb50e0940)
    at kernel/qwidget.cpp:6138
#28 0x00002b63f7074856 in QFrame::event (this=0x949320, e=0x7fffb50e0940)
    at widgets/qframe.cpp:655
#29 0x00002b63f70eae09 in QAbstractScrollArea::viewportEvent (this=0x112b7f0, 
    e=0x2b6408503e13) at widgets/qabstractscrollarea.cpp:924
#30 0x00002b63f7163795 in QAbstractItemView::viewportEvent (this=0x949320, 
    event=0x7fffb50e0940) at itemviews/qabstractitemview.cpp:1369
#31 0x00002b63f70ebdc8 in QAbstractScrollAreaFilter::eventFilter (
    this=<value optimized out>, o=<value optimized out>, e=0x1)
    at widgets/qabstractscrollarea_p.h:93
#32 0x00002b63f6d722df in QApplicationPrivate::notify_helper (this=0x64ed50, 
    receiver=0xa8bb10, e=0x7fffb50e0940) at kernel/qapplication.cpp:3548
#33 0x00002b63f6d763fd in QApplication::notify (this=0x7fffb50e1380, 
    receiver=0xa8bb10, e=0x7fffb50e0940) at kernel/qapplication.cpp:3255
#34 0x00002b63f65d067b in KApplication::notify (this=0x7fffb50e1380, 
    receiver=0xa8bb10, event=0x7fffb50e0940)
    at /tmp/buildd/kde4libs-4.0.1/kdeui/kernel/kapplication.cpp:314
#35 0x00002b63f5cde420 in QCoreApplication::notifyInternal (
    this=0x7fffb50e1380, receiver=0xa8bb10, event=0x7fffb50e0940)
    at kernel/qcoreapplication.cpp:530
#36 0x00002b63f6dc62d2 in QETWidget::translateMouseEvent (this=0xa8bb10, 
    event=<value optimized out>)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:203
#37 0x00002b63f6dc5321 in QApplication::x11ProcessEvent (this=0x7fffb50e1380, 
    event=0x7fffb50e0ff0) at kernel/qapplication_x11.cpp:3025
#38 0x00002b63f6de7dd7 in x11EventSourceDispatch (s=0x652250, callback=0, 
    user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:135
#39 0x00002b63f8717eb4 in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
#40 0x00002b63f871b19d in ?? () from /usr/lib/libglib-2.0.so.0
#41 0x00002b63f871b66e in g_main_context_iteration ()
   from /usr/lib/libglib-2.0.so.0
#42 0x00002b63f5cff451 in QEventDispatcherGlib::processEvents (this=0x64a7c0, 
    flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:338
#43 0x00002b63f6de7c0f in QGuiEventDispatcherGlib::processEvents (
    this=0x112b7f0, flags=<value optimized out>)
    at kernel/qguieventdispatcher_glib.cpp:191
#44 0x00002b63f5cdd908 in QEventLoop::processEvents (
    this=<value optimized out>, flags=<value optimized out>)
    at kernel/qeventloop.cpp:140
#45 0x00002b63f5cdda26 in QEventLoop::exec (this=0x7fffb50e12f0, 
    flags=@0x7fffb50e1300) at kernel/qeventloop.cpp:182
#46 0x00002b63f5cdfb81 in QCoreApplication::exec ()
    at kernel/qcoreapplication.cpp:759
#47 0x0000000000417f27 in main (argc=5, argv=0x7fffb50e16c8)
    at /tmp/buildd/kdebase-workspace-4.0.1/systemsettings/main.cpp:64
#48 0x00002b63f7b511c4 in __libc_start_main () from /lib/libc.so.6
#49 0x0000000000412689 in _start ()
#0  0x00002b63f7bd0b10 in __nanosleep_nocancel () from /lib/libc.so.6