Okay so I am making progress. I took the morph example that works and looks like this:

Then, after export the treads as a Morph from POSER PRO 2012 - I imported it into BLENDER and modified the tread. I loaded the morph in POSER and gave it a value of 1.000:

But, when I use the "Track Mover" morph provided with the original model - the treads move but at the point the value is 1.0, 2.0, etc. a BULGE develops at the curves around the wheels:

I'm wondering what I am doing that creates this unusual morph? Running as an animating the "bulge" makes the treads bounce up and down on the front and rear. I would appreciate any suggestions. Thanks!

Windows 10 - Poser Pro 2012 - 64Bit - 24GB RAM - 4 x 3.40 GHZ processor