That was actually the biggest reason I wanted to have an invisible Material Preset, as a lot of times, turning the transparency to full didn't work, it still left ghosting... probably due to some settings I don't have access too in Debut so I couldn't see them as I changed everything else. So the suggestion of creating a Material Preset using the ground worked great since it was so generic.

 

Anyway the left render is effected by ghosting (around the arms) and the right is using the preset I saved earlier.

Poser scripts by Snarlygribbly