Problem with Deformers. Deformation chains aren't moving the artwork at all.

So I’m just trying to create a simple rubber-hose style leg on a character rig I created. I select the artwork layer of the leg, I select the rigging tool, I click once where the leg connects to the waist, click again where the knee would be, then again where the leg connects to the foot. I adjust the articulation circle then click the transformation tool. The deformation chain appears green meaning I should now be able to play with it, only when I try, nothing happens. The artwork layer doesn’t budge at all despite how much I move the green deformation chain.