Building and running the ExtApp works fine. BUT building an installer and then running the ExtApp makes problems: The level window presets are not shown, when right clicking on the level window bar. If you close the application afterwards it crashes with the following error log message:
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x00007fff85ba2ce2 __pthread_kill + 10
1 libsystem_c.dylib 0x00007fff848427d2 pthread_kill + 95
2 libsystem_c.dylib 0x00007fff84833a7a abort + 143
3 libPocoFoundation.1.3.5.dylib 0x00000001006ed7de Poco::SignalHandler::handleSignal(int) + 62
4 libsystem_c.dylib 0x00007fff84894cfa _sigtramp + 26
5 QtCore 0x0000000101657bbb QObject::~QObject() + 43
6 libQmitk.dylib 0x000000010fc001a1 QmitkLevelWindowWidgetContextMenu::getContextMenu(QMenu*) + 2545
7 libQmitk.dylib 0x000000010fc1790f QmitkSliderLevelWindowWidget::contextMenuEvent(QContextMenuEvent*) + 223
8 QtGui 0x00000001008fb331 QWidget::event(QEvent*) + 1905