Without seeing your files,
I think I know the problem.
The Verts and Normals are mixed in the obj file.
Open it with Notepad.
If you see something like this.......
vn -0.159476 0.832179 0.531079
v -0.000302 0.002111 0.000229
vn -0.731135 0.495238 0.469235
v -0.001705 0.001193 0.000218
vn -0.627004 0.779001 -0.004775
v -0.001090 0.001784 0.000224
vn -0.994166 0.107571 -0.007858
v -0.002031 0.000405 0.000213
vn 0.626833 -0.779146 0.003529
v 0.001298 -0.001867 0.000215
vn 0.994173 -0.107597 0.006625
v 0.002239 -0.000488 0.000226
vn 0.309144 -0.950995 -0.006160
v 0.001019 -0.002056 -0.013196
vn -0.453663 -0.891096 -0.011727
That's the problem.
Mesh Lab is a good program but it screws the obj file format for S3D.
That's how I found this problem.
I open the obj in RH and save and the problem is corrected.
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