ctkCollapsibleGroupBox (and ctkCollapsibleButton) were setting the visibility of the newly added child spinbox to ON (at backtrace line 5). As a side effect, QAbstractSpinBox::setLineEdit() was calling updateEdit() which was trying to access some RTTI information that is not yet available (because it was still in the spinbox constructor). See below the backtrace: #0 0x00007ffff6d78d50 in typeinfo for QAbstractSpinBox () from /home/julien/work/qt/qt-4.8.5/lib/libQtGui.so.4 #1 0x00007ffff65bb3b8 in QDoubleSpinBoxPrivate::textFromValue (this=0x1768890, f=...) at widgets/qspinbox.cpp:1279 #2 0x00007ffff64f9449 in QAbstractSpinBoxPrivate::updateEdit (this=0x1768890) at widgets/qabstractspinbox.cpp:1736 #3 0x00007ffff64f4e83 in QAbstractSpinBox::setLineEdit (this=0x1768860, lineEdit=0x1741840) at widgets/qabstractspinbox.cpp:686 #4 0x00007ffff64f87b9 in QAbstractSpinBoxPrivate::init (this=0x1768890) at widgets/qabstractspinbox.cpp:1558 #5 0x00007ffff64f401a in QAbstractSpinBox::QAbstractSpinBox (this=0x1768860, dd=..., parent=0x16bb7d0) at widgets/qabstractspinbox.cpp:152 #6 0x00007ffff65b8fae in QDoubleSpinBox::QDoubleSpinBox (this=0x1768860, parent=0x16bb7d0) at widgets/qspinbox.cpp:603 #7 0x00007ffff7283ab2 in qdesigner_internal::WidgetFactory::createWidget (this=0x8df9f0, widgetName=..., parentWidget=0x16bb7d0) at uilib/widgets.table:75 [...] #41 0x00007ffff569706e in QEventLoop::exec (this=0x1489ac0, flags=...) at kernel/qeventloop.cpp:204 #42 0x00007ffff60d7438 in QDragManager::drag (this=0x1731a20, o=0x12b1780) at kernel/qdnd_x11.cpp:2028 #43 0x00007ffff6035bc1 in QDrag::exec (this=0x12b1780, supportedActions=..., defaultDropAction=Qt::CopyAction) at kernel/qdrag.cpp:284 [...] #56 0x00007ffff66b53cd in QAbstractItemView::pressed (this=0x12b5f00, _t1=...) at .moc/debug-shared/moc_qabstractitemview.cpp:340 #57 0x00007ffff66a8b79 in QAbstractItemView::mousePressEvent (this=0x12b5f00, event=0x7fffffffcf90) at itemviews/qabstractitemview.cpp:1693 [...] #68 0x00007ffff6024b9d in QCoreApplication::sendSpontaneousEvent (receiver=0x12b5f40, event=0x7fffffffcf90) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:234 #69 0x00007ffff601eb61 in QApplicationPrivate::sendMouseEvent (receiver=0x12b5f40, event=0x7fffffffcf90, alienWidget=0x12b5f40, nativeWidget=0x95b2e0, buttonDown=0x7ffff6dbaa58, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3171 [...] #78 0x00007ffff5696ee4 in QEventLoop::processEvents (this=0x7fffffffddf0, flags=...) at kernel/qeventloop.cpp:149 #79 0x00007ffff569706e in QEventLoop::exec (this=0x7fffffffddf0, flags=...) at kernel/qeventloop.cpp:204 #80 0x00007ffff569a0b8 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1221 #81 0x00007ffff601f776 in QApplication::exec () at kernel/qapplication.cpp:3823 #82 0x0000000000432a07 in main (argc=1, argv=0x7fffffffdfa8) at main.cpp:57 Closes #349

CMake scripts - Command keyword should be lowercase #78

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