boolean operations not rendering correctly?

[Ambrose007]

Okay, so although I have been using wings3d on and off for the last 10 years, I have not really progressed past basic box modeling and manipulation of the faces. Even my face manipulations have been very pedestrian, so I will accept the title of noob.

Currently I am running the manifold version of wings and have been playing with the boolean subtraction function. In wings it looks fantastic, so i export my obj file and try to render it, here lies my problem. In poser, I get a twisted mesh in the preview and no holes from my subtraction when I render. In Bryce the preview of the mesh looks fine in wireframe but the render is crumpled though the holes are there. In Daz Studio the results are the same as poser for the most part. Has anybody had these issues? Is there a step I am missing before my export?

I have attached images and the wings file.
Any help would be great
Thanks

Amb