When I did the origanl head expression morphs, I don't remember seeing ANY head bobbling.  I'll take a look in Poser and see where it's coming from.

EDIT: After checking, I found no lateral movements or wobbles when the morphs are applied to the head actor.    I used versions 91,96 an 114. I'm not sure what you are observing, Mikej.

What Version are you using and what kind of movements are you seeing on what morphs?  Olaf might be able to help more than I have.

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