They look exactly like smoothing artifacts, either unwelding the planes that comprise the model or adding control edges will fix this. I'm not seeing any bevels in your object, Cage... So, your intention doesn't seem to be to have small rounded edges on the object to pick up specular. I would just unweld all of the planes of the .obj rather than go through the tedious task of adding control edges at this point. Remap in wings.

...If I were to do this I would just select each planar "face" of the object and file/export selected, reimport each chopped part in turn and select each part in object mode via the geometry graph, object context menu/combine, your object is now selectively unwelded but merged into one object, assign new material to all if necessary, and then remap. Of course you could do some of this in UVMapper but Wings is capable of the task.

In terms of the bug in relation to normals in Poser(?), I couldn't say. pretty sure that Poser assigns normals to imported objects (so if you dump the vn lines in the.obj text , no biggie).

_as an aside, I haven't gone past Poser 8 so maybe this is just something I haven't encountered yet.