Scenes with 4D data provoke a crash of the MITK workbench.
In a first step this crash needs to fixed.
As a less critical feature a method for handling 4D data in scene files needs to be implemented.
This bug seems to be indeed a problem with loading 4D images. It can be reproduced by loading the US4DCyl.nrrd from MITK-Data, saving it to a different file location and loading it again. The difference between the source image and the stored one is that the stored one is zipped.