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Hello Andreas,

You were right! That is not a vertex from the triangulation. Thought the 
whole story sounds pretty absurd. I have:

  cout<<"processing vertex "<<(*now)->info().ID()<<endl;
  Delaunay::Face_circulator fc = dt.incident_faces(*now);
  for(int j=0; j<circulator_size(fc); j++)
  {     
     cout<<"processing vertex "<<(*now)->info().ID()<<endl;
     fc++;
  }

The first access to the vertex is OK, but the second is not. In theory 
nowhere in between could something have invalidated the handle.

I think I should just stick to using my code in debug mode...

Thanks for your advice,
Angelina