Quote - What is a wireframe going to prove?
It's a one-sided plane with a hole in it. Four quads (lines connecting the corners, like a picture frame).

EDIT- I just checked. It worked fine in Poser 5 too.

You, Sir, do not have a hole IN the face, you have your hole BETWEEN THE FACES. And This, Sir, is  something completely different to what you're pretending to talk about.