The "bulging" is something P5 does to certain objects. Simply turn off "Smooth Polygons" for the offending object OR do it in Render Settings in general. It should have been mentioned in the Readme, yes, but it doesn't REALLY mean it won't work in FireFly (or P5). As long as you turn off the Smoothing it'll work fine.

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.