sbar@laptop ~ $ gdb -silent --eval-command=r --eval-command=bt designer Reading symbols from /usr/bin/designer...Reading symbols from /usr/lib64/debug/usr/bin/designer.debug...(no debugging symbols found)...done. (no debugging symbols found)...done. Starting program: /usr/bin/designer [Thread debugging using libthread_db enabled] [New Thread 0x7fffec089700 (LWP 19119)] Application asked to unregister timer 0xa000003 which is not registered in this thread. Fix application. Application asked to unregister timer 0xe000002 which is not registered in this thread. Fix application. Program received signal SIGSEGV, Segmentation fault. 0x00007ffff6554df3 in QRegion::~QRegion() () from /usr/lib64/qt4/libQtGui.so.4 #0 0x00007ffff6554df3 in QRegion::~QRegion() () from /usr/lib64/qt4/libQtGui.so.4 #1 0x00007ffff0ab8e37 in QGraphicsViewPrivate::~QGraphicsViewPrivate() () from /usr/lib64/qt4/libQtDeclarative.so.4 #2 0x00007ffff0ab91b9 in QDeclarativeViewPrivate::~QDeclarativeViewPrivate() () from /usr/lib64/qt4/libQtDeclarative.so.4 #3 0x00007ffff5b9334c in QObject::~QObject() () from /usr/lib64/qt4/libQtCore.so.4 #4 0x00007ffff6408cda in QWidget::~QWidget() () from /usr/lib64/qt4/libQtGui.so.4 #5 0x00007ffff69ec455 in QGraphicsView::~QGraphicsView() () from /usr/lib64/qt4/libQtGui.so.4 #6 0x00007ffff0ab5bb1 in QDeclarativeView::~QDeclarativeView() () from /usr/lib64/qt4/libQtDeclarative.so.4 #7 0x00007ffff73b35ba in qdesigner_internal::WidgetDataBase::defaultPropertyValues(QString const&) () from /usr/lib64/qt4/libQtDesigner.so.4 #8 0x00007ffff73b3a29 in qdesigner_internal::WidgetDataBase::grabDefaultPropertyValues() () from /usr/lib64/qt4/libQtDesigner.so.4 #9 0x00000000004385b9 in QDesignerWorkbench::QDesignerWorkbench() () #10 0x000000000042fa1d in QDesigner::initialize() () #11 0x000000000042ffb8 in QDesigner::QDesigner(int&, char**) () ---Type to continue, or q to quit--- #12 0x000000000042e74f in main () (gdb)