In the SetDefaultProperties() method, the ImageVtkMapper2D sets default properties of the DataNode, e.g. levelWindow .
In this case (LevelWindow) the Image-Reader stores the LevelWIndow values from the DICOM Images in the propertyList of the mitk-image.
However, the ImageVtkMapper2D tries to find those properties in the PropertyList of the DataNode instead of the Image.
Should be fixed...