> Moi's n-gon meshes are not suitable for subd smoothing because the
> extra vertices which create the n-gons are not matched up to the vertices
> on the coneccted faces.

Hi Jonah, that's not correct, there should be a complete alignment between all vertices of adjacent polygons across a joined edge.

If there is any mis-matching, then either you have an unjoined edge in your NURBS model there, or you've run into a bug.

Can you please post an example of the non-matching vertices that you're talking about so I can see what is happening for you?

- Michael