Armature not effecting mesh in GE

http://www.pasteall.org/blend/8085

Why is it that the armature is not effecting the mesh (The stomach part) in GE while doing all correctly in normal animation?

The part concerned is the stomach, the robot of the blend has diffrent objects for each part, parented singularly with each bone, but I needed some organic movements for that part, so I parented the object to the whole armature and used a bit of weight paint.

You must parent the Sphere.001 to the Armature.