3D Studio - Biped Head Bone won't evaluate

I currently have a bunch of rigs for a project I am working on - unfortunately they are rigged with linear position bones, no problem if I run the script off of the forum topic ( http://www.facefx.com/forums/dont-use-linear-position-controllers-3d-st… )
The only problem I run into is with head gestures - because the ehad bone is biped it gives me an error when attempting to include head in the solve.
How would I best overcome this obstacle without re-rigging the 6 characters ?

What version of FaceFX and what version of 3dsmax are you using?

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I'm using 3D Studio Max 2011 64Bit, and the newest Facefx plugin

The newest FaceFX plugins (I assume you're using FaceFX 2010?) do support animating a biped head bone. Can you send us your FaceFX 3dsmax plugin log file when you try to do this?