Chamfered edge / meshsmooth problem

[Station]

Hi
I'm having a problem with 3DSMax and it's meshsmooth function.

I've got a bonnet. It has been chamfered around the edges (it's a 90 degree corner), copied across using -symmetry- modifier and -meshsmooth-ed.

The chamfer at the meets in the middle dips down. It's like it is ignoring the chamfer and just merging a load of vertices together.

I've tried everything, changing threshold, etc. Still does it.

The standard edge:
http://img.photobucket.com/albums/v25/stationmiek/4.jpg

Meshsmoothed edge:
http://img.photobucket.com/albums/v25/stationmiek/1.jpg

Standard -Symmetry- edge
http://img.photobucket.com/albums/v25/stationmiek/3.jpg

Meshsmoothed and Symmetry edge
http://img.photobucket.com/albums/v25/stationmiek/2.jpg

:blah:

[BiG ToE-3DT]

tone down the threshold on the symmetry, and make sure you dont have any wondering verts for the mesh smooth to round on.

[Station]

Tried the threshold, it either doesn't 'weld' together or just overwelds.
Everything is fine, no extra vertices either. I've had this a few times in the past and there was nothing that would fix it!

[Kanno]

Definitely looks like a threshold issue to me. Did you try a threshold of 0 or something like .001? Or maybe try scaling the geometry up and trying again.

[Station]

I don't think it's threshold, but I don't really have a standard size will my models, so I may try scaling up. I once imported a wheel into one of my car models, and the car could actually sit in the wheel nut hole because it was so out of scale!