Kinect Avateering Rig problem

So my company wanted me to take the Rig from the "dude" model Microsofts uses for its avateering process with the kinect. Thats where you stand in front of the kinect and there is a model on screen, and whatever you do, the model does.

So the rig is really simple and straight forward. No IK or contraints anywhere.

I attached the rig unchanged to a very simple model of our company mascot. I do the paint weights, and I feel very confident that they are solid paint weights. I can move the joints around in Maya and the mesh deforms very convincingly.

But when exported as fbx. file and used in avateering process, if you raise your arms ( like this: " ) the mesh's biceps get deformed and twisted. Have no idea what could be causing it at this point.

I realize its vague but figured I might as well ask.

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