I am trying to create a script that randomly put values in bend,twist,side-side. It works except for one slight problem, Twist doesn't seem to want to work. I am currently writing it as:

scene = poser.Scene()
figure = scene.CurrentFigure()

p1 = figure.Actor("Chest").Parameter("Twist").SetValue(2) 

I tried this in the PoserPython Shell. If I did bend or side-side, it works. For twisting, it doesn't. Am I writing this wrong?

In the shell try 

[ p.Name() for p in figure.Actor("Chest").Parameters() ]

and check the list to be sure you have the right parameter-name.

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I've had the same problem with some figures, especially the Millenium ones like Victoria 3 and Michael 3. I never found an explanation or a real solution, but I have an annoying workaround:

I rename all the 'Twist' parameters to something else, and make my scripts use that new parameter name (I use 'Twost'). What's annoying about this is that I can't do the renaming from a Python script. I have to go in and manually rename every Twist parameter. I now keep pre-Twosted figures in my library.

IIRC eg. V4 has two twist channels in the chest actor, that's why it does not work.

One solution is to do it like this:

for p in figure.Actor("Chest"):
 if p.Name=="twist": p.SetValue(2)

Use the parameters InternalName. InternalName() is unique  for each parameter.

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 I must be typing it wrong, because when I do...I get a "nonsequence" error.

Sorry, it should work like that:

for p in figure.Actor("Chest").Parameters():
 if p.InternalName()=="yrot": p.SetValue(2)

You are talking about setting the X,Y,Z rotate values for a body part. ?

I use this format after getting the actor object.

parm = actor.ParameterByCode(poser.kParmCodeXROT)

 Ok, I need a slap in the head. For a brief moment of insanity..I forgot you have to put an enter after if blah=blah : :) I got it working now. Thanks.:)