This might have something to do with whether or not you clicked "Smooth"  
in Blender while having a set of vertices selected.

I wrote an export script in blender (with python) that is much more  
lightweight than POVanim, and I spent weeks fixing the same problem - It  
turns out you actually have to tell Blender which vertices you want  
"Smooth".  Or there is a button on the mesh edit area, can't remember.

Try that before an export.

Thanks
Caleb

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