Turn off all your IK.

import poser

scene = poser.Scene()

def run():
    if not scene.CurrentFigure():
        return
    fig = scene.CurrentFigure()
    if fig.NumIkChains():
        iklist = []
        for i in range(fig.NumIkChains()): # Turn off IK and store the settings           
            fig.SetIkStatus(i,0)
    scene.DrawAll()
run()

Poser could use some improving, in places where that somehow never seems to happen.  Largely, though, it's more good than bad, once you get to know it.  Getting to know it is the tricky part, but also much easier than my experiences in trying to learn Modo or Blender.

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.