Quote - What viewer are you using to look at PNG?  Sounds like it might be viewer dependent.

 

I don't think it's viewer dependent.  Both Windows preview (not color managed) and Photoshop CS5 (color managed) show the same thing.

 

And it works fine in Poser 8.  I'm using the same viewers.

 

Weirdly, rendering over black doesn't actually produce a black background.  It's the same mud brown I get using the default Poser background.  Using "render over black" in Poser 8 gives me a black background.