"Asymmetry is a problem with Poser. I doubt the model was built asymmetrical, however I know from personal experience and other top vendors I've spoken to in the past, that Poser will randomly knock a model out of symmetry depending on how the model is saved into the library. It happens in very small increments and in various ways, and not all the time. It's been an on-going issue for many versions that makes content creation all the more frustrating, that S-M has yet to fix or even acknowledge."

What? First I've heard of this... unless you're referring to posers native scale causing slight translations when importing and exporting back and forth between apps (without using pml or go plug)... only solution I've found is scaling to 1000 and subtractive morphing.

One more thing to worry about with using poser. Apologies for ot.