Hey there, first thing, big thanks to you, without your contributions Spriter and Unity would not be possible. Fantastic job!
Essentially my problem is that I am scaling a chest bone to simulate breathing, when imported into unity, the head actually scales and seems to lift up off the body. Also, I am not seeing the chest rotate properly. In spriter, this all looks fine.
I put a note in the assets folder further describing the problem.
Full Unity Project & Spriter files in Assets\Textures\Villain_1 to demonstrate the issue on my public box.com account:
https://app.box.com/s/2qca6nwvtxxm3u93j0nx
I am using Unity 4.3 and Spriter B6.
Thanks much!