in each Poser, each background will turn transparent when exported as PNG. It's not just black, it's not just P10 (and it's not just PNG either).

So, use JPG or BMP instead, or add the background in Photoshop or alike afterwards, or add a black object for background in the scene (a dome or so). 

- - - - - 

Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though