phantom3D, pjz99: I don't think trying to rebuild the rig from scratch is a good approach to this problem. It will just show up at a different place. Since Poser has now memory of how you built the rig, all the relevant information must be in the CR2. The best approach to this would be to try and isolate the problem: find the smallest possible skeleton with the least functionality (such as bulges, JCMs and inner/outer spheres) enabled that still shows this problem.

Actually, I'm still not convinced that it's not just a local problem. So my first attempt would be to disable the inner/outer spheres for the shoulder joints and see if the asymmetries disappear. If they're still there, we know it's not the spheres. Next, I'd look at the angles and see if changing them in various ways solves the problem. And so on... It may take a long time, but isolating the problem might not only indicate ways to work around it, but will also increase the chances that SM will eventually fix it.

-- I'm not mad at you, just Westphalian.