Thanks, Jordan. I appreciate the feedback. I did try adding a third argument to the -s attribute but still no joy. The Obj reader seems to accept only images with no scaling.
I took a closer look at the specs:
Quote-s u v w
The -s option scales the size of the texture pattern on the textured
surface by expanding or shrinking the pattern. The default is 1, 1, 1.
"u" is the value for the horizontal direction of the texture
"v" is an optional argument.
"v" is the value for the vertical direction of the texture.
"w" is an optional argument.
"w" is a value used for the depth of a 3D texture.
"w" is a value used for the amount of tessellation of the displacement
map.
It appears that the -s attribute requires only the "u" parameter. "v" and "w" are optional. So it should work with one, two, or three values, no?
I understand that this is an easy fix. I always rebuild imported shading networks anyway. But . . . it should work. And the error message, which is a little misleading, could stump new users. (I recall getting many missing texture errors early on, and just worked around them.)