Mecanim control fails with Vuforia AR camera/target

So I've taken some bones and scripts from the Mecanim Tute and made a football player that I'm hoping to eventually control with scripting. Point is, my player runs, jumps and waves with keyboard input just fine...until I put in the AR Camera and image tracker...and then the player sinks halfway into the pitch in the crab position as if I were testing the muscles in Mecanim configuration mode.

Any ideas? Ta