Tangent Assembly Constraint issue

Is there a correct way to utilize the tangent assembly constraints? I broke it down to a very simple example to test it and they appear to only work for perfectly round objects. For ovals and spline based profiles, I get the result below.


https://media.giphy.com/media/3o7abK...DYvm/giphy.gif

Also, if a ZW3D rep see's this; registration for your forums is not working.

Hi, I am Sean, sales rep for USA, can you email me at [email protected] of your questions with ZW3D files? So I can have our engineer to help you.