Using the "Save Project" function of the workbench (button or menu entry), the 'mitk::SceneIO'-class is used to store data node and base data information in XML-format.
However, when trying to save a scene with a MultiLabel segmentation, the error:
No serializer found for LabelSetImage. Skipping object.
appears.
Loading the scene file will not restore the previously created LabelSetImage. Since a LabelSetImage is also created for single segmentations, this is highly critical.