Shadow catcher doesn’t work in poser 11 SF. In P12 there were issues, but I don’t remember what they were and my poser computer dies so I can’t check. If you render over a background shader rather than a sphere it works fine in the same manner as firefly. 

If you want to use Ezdome it has its own shadow catcher that it can setup 

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I use Poser 13 and win 10