Uh, oh.

Another confusion between modelers and Poser...

Poser does NOT read the "normal" info from any imported files (normals indicate "which way is out").  It ignores them completly, and re-calculates the normals from the winding order of the polys. One-sidedly.
So double-sided surfaces totally confuse it. (To see this in effecct, just load a"square" prop (NOT the single-sided one) from PoserProps-> Primitives library, scale it up (or zoom in), just to see it in close-up, then apply6 any texture to it. Render. In firefly, there will be black polys, in the P4 renderer there will be strange horizontal lines that stretch across the texture (and the rest of the scene)..

Poser assumes single sided polys on import - so if the polys of the model are 2-sided, it can't cope - it doesn't know which way is up...hence black splodges and/or horizontal lines.

Poser should get its act together (after all they still include the "square" prop, which is double-sided and doesn't work properly - in P6 yet), but til that happens, the only option is some severe mangling in a 3D app to "thicken" the wing and some (also severe) work in re-mapping it...

Unless I'm completely out of touch and have missed something fundamental - not unlikely...

But anyway,
Cheers,
Diolma