Everything was working fine until I copied the object's lower left leg and pasted it onto his upper right leg. Now, in my bone layer, when I move his lower left leg his lower right leg moves with it.
Is it because the lower right leg doesn't have a bone in it?
Well... it is in the scripting section of the forum. It is brand new.
Moho has scripting abilities to expand it's abilities. I wouldn't reccomend it at this point yet since it is still kind of new and may cause problems for you that you may not be prepared for.
IK is the parenting relationship of bones. Bones can be linked together in chains. there is a tool for linking one bone to another bone.
If a bone is a child of another bone it will follow it around... it rotates with it... and translates with it... it also can bend and translate on its own.. like the forearm is the parent of the hand.