Hi,
I found that after working with the PolyNURBS (cut feature to finish the editing process) and checking that there are no intersections on the model I quit the Cut tool and it tells me that the part has intersections and I should fix them with the PolyNURB tool. When I try to do this (of course it can't be edited after the cut operation) I click on the PolyNurbs feature and inspire crash and close.
I hope it helps to fix the problem
regards
Agustin