Be careful with old scene: they often have ambient occlusion. Till Poser12, the presence of this node used to make the render turn black.
I haven't tested this aspect with Poser13 because since 2019 I use one of the scripts provided with Sasha: it deletes all these nodes in one shot, and it's something I'm launching it systematically

𝒫𝒽𝓎𝓁

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