How to reproduce:
- Use the 'Signal Generation' tab in the 'Synthetic Data' workflow to generate a dummy image
- Go to the first tab ('Fiber Definition') and click the circle to add the first ROI in the data --> immediate crash!
Reason: it happens in the itk::Object::AddObserver called by the QmitkSegmentationView::NodeAdded ( which is messaged by the EmitAddNodeEvent but probably not loaded ).