Open the moose panel.
Browse a small model.
on 'all famixClasses', rigth click and click on Utilities >> Compute duplication.
Now, from 'all dudemultiplications', browse 'constellation'.
In the browser, when clicking on a multiplication, opening the GLMDiffPresentation raise an error: Message not understood: GLMDiffPresentation >> allowsDeselection.

http://code.google.com/p/moose-technology/issues/list?thanks=449&ts=1283506221