make sure you have bend checked in the properties of the actors. It needs to be set 1 level above/below, in the hierarchy, of each actor you want affected. So for head you would need to have it enabled for neck/head/jaw. And so forth. Of course you will also have to adjust joint parameters to affect how far each actor is affected. You do not want it turned on for the eyes though, as it would warp the head when you try to turn them.

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Consider me insane if you wish, but is your reality any better?