It breaks for me because of the added magritteDescriptions to MADescription and MAElementDescription. Both MADescription>>descriptionXmlElementName and MAElementDescription>>descriptionAttributeName.
In the first case, the accessor of the description tries to get the elementName of its xmlTarget (don’t know if that makes sense). The xmlTarget in turn says “subclassResponsibility”. In the second case, it tries to get the attributeName of the xmlTarget. I get a DNU like I said earlier. Again, something is wrong with “xmlTarget”. This one can be triggered using the editor.
