[Moose-dev] petit gui in pharo 1.3?

I'm in the progress to change all my working images to pharo 1.3. Now I encounter that the PetitGUI is not working in pharo 1.3 for me. I've built the image from pharo 1.3 core. I loaded PetitGui via ConfigurationOfPetitParser which gives me the same package revisions that I have in my 1.2 image. I fixed a missing super initialize in GLMLoggedObject and that enables me to open the petit gui. I can see an the left side all parser classes to chose from. But clicking on any of them does not give the rule selection in the right side (and of course no pane at the bottom). Are there any known issues? Are there hints how to fix it or where to look at? thanks, Norbert