Laurie, exporting from Poser and then importing it back still has the same problem.  Also have tried exporting from Blender and Poser as 3DS format and then converting back to OBJ and reimporting, same problem.

Tried exporting at 10x intended size, imported.  Renders okay until I scale it down to 10% (to make it appropriate size) and back to wonky shadows.

Even tried exporting in the original scale (no scaling) and then scaling down in Poser, no go.  BTW, original scale is giagantic in Poser, so I'm wondering if I just started way too big.  How much larger are your items in your modeling software vs final size?

Its got to be something to do with scaling, that seems to be the main variable.