It's ironic how badly Anim8or actually supports animation
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Each limb in an object has a unique pivot point, this is the joint - and if all the limbs are in position and their pivot points are not set, say they're in the centre - then you'll get this problem.
It wouldn't take long to rig up your robot if you fancy sending it to me - 3DS Max is the best program for rigging hierarchy animation IMO, just let me know what animations you need, or alternatively you could code the animations yourself with the rigged model. Once you load the model into DBPro you can offset the limb angles to make it move as if it was animated, quite a useful trick to know.
Aegrescit medendo