In the Preview in Poser 7 Mac my object shows correctly but when I render it is totally black. Never had this happen before. Any ideas????

With the object selected, could you post a screen shot of the material room advanced tab? It might give us a clue.

Also, check that the normals are forwards.

is it the first/only thing that you loaded into the scene?

Here you go.

Quote - is it the first/only thing that you loaded into the scene?

Yes only thing in the scene. Also It works right in Poser 8.

If I put a primitive like a sphere then the milk carton renders correctly. What is up?

Same as in Poser 8 if I have another obj it renders OK but remove the object or figure and render is once again black.

it's a known bug.  small objects exhibit self-shadowing by a square shadow map.
incr. obj. size to figure size and it renders properly.  or add second obj to increase scene size.
in addition, uncheck "refl. lite mult" - bad poser 4 setting.

Will do....

Did that and it fixed the problem. But it screws my proportions.

Put another object in the scene, such as the one sided square.  Keep it out of the camera view and your prop should render ok. 

Yes that works.

There's your solution.  Not elegant but at least it works. 

Thanks everyone