Version:           4.0.2 (KDE 4.0.2) (using 4.0.2 (KDE 4.0.2), Kubuntu packages)
Compiler:          gcc
OS:                Linux (i686) release 2.6.24-12-generic

Selecting Samba from the Advanced tab in System Settings causes System Settings to Crash. If System Settings is run from a console the following output occurs:

systemsettings(8533) MainWindow::selectionChanged: Selected item:  "Samba"
systemsettings(8533) MainWindow::selectionChanged: Comment:        "A module to configure shares for Microsoft Windows"
QMetaObject::indexOfSignal:KPageDialog: Conflict with KDialog::close()
Object::connect: No such signal QRadioButton::stateChanged(int)
Object::connect:  (sender name:   'shareRadio')
Object::connect:  (receiver name: 'KcmInterface')
Object::connect: No such signal QRadioButton::stateChanged(int)
Object::connect:  (sender name:   'userRadio')
Object::connect:  (receiver name: 'KcmInterface')
Object::connect: No such signal QRadioButton::stateChanged(int)
Object::connect:  (sender name:   'serverRadio')
Object::connect:  (receiver name: 'KcmInterface')
Object::connect: No such signal QRadioButton::stateChanged(int)
Object::connect:  (sender name:   'domainRadio')
Object::connect:  (receiver name: 'KcmInterface')
QWidget::setLayout: Attempting to add QLayout "" to QWidget "tab3", which already has a layout
QWidget::setLayout: Attempting to add QLayout "" to QWidget "tab6", which already has a layout
QWidget::setLayout: Attempting to add QLayout "" to QWidget "tab7", which already has a layout
QWidget::setLayout: Attempting to add QLayout "" to QWidget "tab8", which already has a layout
QWidget::setLayout: Attempting to add QLayout "" to QWidget "TabPage2", which already has a layout
QWidget::setLayout: Attempting to add QLayout "" to QWidget "TabPage3", which already has a layout
QWidget::setLayout: Attempting to add QLayout "" to QWidget "tab9", which already has a layout
QWidget::setLayout: Attempting to add QLayout "" to QWidget "tab10", which already has a layout
QWidget::setLayout: Attempting to add QLayout "" to QWidget "tab11", which already has a layout
QWidget::setLayout: Attempting to add QLayout "" to QWidget "tab12", which already has a layout
QWidget::setLayout: Attempting to add QLayout "" to QWidget "tab13", which already has a layout
QWidget::setLayout: Attempting to add QLayout "" to QWidget "tab14", which already has a layout
QWidget::setLayout: Attempting to add QLayout "" to QWidget "tab15", which already has a layout
QWidget::setLayout: Attempting to add QLayout "" to QWidget "tab16", which already has a layout
QWidget::setLayout: Attempting to add QLayout "" to QWidget "tab17", which already has a layout
QWidget::setLayout: Attempting to add QLayout "" to QWidget "tab18", which already has a layout
QWidget::setLayout: Attempting to add QLayout "" to QWidget "tab19", which already has a layout
QWidget::setLayout: Attempting to add QLayout "" to QWidget "TabPage4", which already has a layout
QWidget::setLayout: Attempting to add QLayout "" to QWidget "TabPage5", which already has a layout
QWidget::setLayout: Attempting to add QLayout "" to QWidget "tab20", which already has a layout
QWidget::setLayout: Attempting to add QLayout "" to QWidget "tab21", which already has a layout
Load smb config files from /dev/null
Loaded services file OK.
Server role: ROLE_STANDALONE
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = systemsettings path = <unknown> pid = 8533
sock_file=/home/dion/.kde4/socket-Enlightenment/kdeinit4__0

This is consistently reproducable.