Your Firefly render looks to my eyes to be displaying issues related to using too high a shading rate(try 0.2 - 0.5) and perhaps use of texture filtering on the image-map nodes (set to "none"). Displacement set by mistake on materials can cause undesirable bulging or mis-shaping of the model at rendertime, as can polygon smoothing on some models.
I have no idea about D/S default render settings, but Firefly usually needs tweaking.

 

PoserPro2014(Sr4), Win7 x64, display units set to inches.

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