Version:            (using Devel)
Installed from:    Compiled sources

On my laptop I clicked on the power management applet which I have on my panel.
On the popup I see a button at the bottom saying "More...".
Clicking that button I get a crash dialog;

Application: KDE Control Module (kcmshell4), signal SIGABRT

Thread 1 (Thread 0xb5e72700 (LWP 1946)):
[KCrash Handler]
#6  0xb7eeb424 in __kernel_vsyscall ()
#7  0xb688d640 in raise () from /lib/i686/cmov/libc.so.6
#8  0xb688f018 in abort () from /lib/i686/cmov/libc.so.6
#9  0xb7672794 in qt_message_output (msgType=QtFatalMsg, 
    buf=0xbff03ab0 "ASSERT: \"uniformSpacer >= 0 || spacing >= 0\" in file ../../include/QtGui/private/../../../../../../qt44/src/gui/kernel/qlayoutengine_p.h, line 48")
    at /usr/local/data/qt44/src/corelib/global/qglobal.cpp:2076
#10 0xb76727f8 in qFatal (msg=0xb77f5710 "ASSERT: \"%s\" in file %s, line %d") at /usr/local/data/qt44/src/corelib/global/qglobal.cpp:2277
#11 0xb7672c44 in qt_assert (assertion=0xb7375be4 "uniformSpacer >= 0 || spacing >= 0", file=0xb7375b90 "../../include/QtGui/private/../../../../../../qt44/src/gui/kernel/qlayoutengine_p.h", line=48)
    at /usr/local/data/qt44/src/corelib/global/qglobal.cpp:1846
#12 0xb6c84438 in QLayoutStruct::effectiveSpacer (this=0x902c3e4, uniformSpacer=-1) at ../../include/QtGui/private/../../../../../../qt44/src/gui/kernel/qlayoutengine_p.h:48
#13 0xb6c831c0 in qGeomCalc (chain=@0x904c6b8, start=0, count=8, pos=9, space=274, spacer=-1) at /usr/local/data/qt44/src/gui/kernel/qlayoutengine.cpp:82
#14 0xb6c6f813 in QFormLayout::setGeometry (this=0x904c5e0, rect=@0xbff05cc8) at /usr/local/data/qt44/src/gui/kernel/qformlayout.cpp:1462
#15 0xb6c7f83f in QLayoutPrivate::doResize (this=0x904c5f8, r=@0xbff05d88) at /usr/local/data/qt44/src/gui/kernel/qlayout.cpp:607
#16 0xb6c7fe0d in QLayout::activate (this=0x904c5e0) at /usr/local/data/qt44/src/gui/kernel/qlayout.cpp:1180
#17 0xb6cb51df in QWidget::setVisible (this=0x904a238, visible=true) at /usr/local/data/qt44/src/gui/kernel/qwidget.cpp:6530
#18 0xb6c93898 in QWidget::show (this=0x904a238) at ../../include/QtGui/../../../../../qt44/src/gui/kernel/qwidget.h:438
#19 0xb71604f6 in QScrollArea::setWidget (this=0x9038d60, widget=0x904a238) at /usr/local/data/qt44/src/gui/widgets/qscrollarea.cpp:247
#20 0xb715002e in QToolBox::insertItem (this=0x9047930, index=-1, widget=0x904a238, icon=@0xbff05fb4, text=@0xbff05fd4) at /usr/local/data/qt44/src/gui/widgets/qtoolbox.cpp:345
#21 0xb44f4c72 in Ui_profileEditPage::setupUi () from /usr/local/kde/lib/kde4/kcm_powerdevilconfig.so
#22 0xb44f069c in EditPage::EditPage () from /usr/local/kde/lib/kde4/kcm_powerdevilconfig.so
#23 0xb44e3740 in ConfigWidget::ConfigWidget () from /usr/local/kde/lib/kde4/kcm_powerdevilconfig.so
#24 0xb44e1479 in PowerDevilKCM::initView () from /usr/local/kde/lib/kde4/kcm_powerdevilconfig.so
#25 0xb44e205b in PowerDevilKCM::initModule () from /usr/local/kde/lib/kde4/kcm_powerdevilconfig.so
#26 0xb44e26f1 in PowerDevilKCM::PowerDevilKCM () from /usr/local/kde/lib/kde4/kcm_powerdevilconfig.so
#27 0xb44e32df in KPluginFactory::createInstance<PowerDevilKCM, QWidget> () from /usr/local/kde/lib/kde4/kcm_powerdevilconfig.so
#28 0xb7ae6fff in KPluginFactory::create () from /usr/local/kde/lib/libkdecore.so.5
#29 0xb7eb6b37 in KCModuleLoader::loadModule () from /usr/local/kde/lib/libkutils.so.4
#30 0xb7ebbc95 in KCModuleProxyPrivate::loadModule () from /usr/local/kde/lib/libkutils.so.4
#31 0xb7ebc8b3 in KCModuleProxy::realModule () from /usr/local/kde/lib/libkutils.so.4
#32 0xb7ebca18 in KCModuleProxy::buttons () from /usr/local/kde/lib/libkutils.so.4
#33 0xb7eb80c2 in KCMultiDialogPrivate::updateButtons () from /usr/local/kde/lib/libkutils.so.4
#34 0xb7eb869e in KCMultiDialog::addModule () from /usr/local/kde/lib/libkutils.so.4
#35 0xb7ee5e03 in kdemain () from /usr/local/kde/lib/libkdeinit4_kcmshell4.so
#36 0x08048692 in main ()