There may be trouble!

I have run into quite a BIG snag! My blendshapes have encountered quite a massive error and will have to be re done. What has happened is that the movement on the jaw does not effect the mesh when a blend shape has been applied. This can be fixed via the meshes input option, but considering that the head has been combined with the body, the input does not recognize this as the origin for the blendshapes and as such will not do as its bloody told! I am having to redo all the blendshapes which is a pain. Unfortunately i cannot get a screenshot showing the where the error has occurred, so below are images showing the knew blendshapes as they are.