Thanks, Ockham--unfortunately that made things worse--the twist became jerky with big sections shifted up or down.

The original bvh is recorded with the NaturalPoint mocap system, captured to their skeleton, then streamed to Daz M4 via their plugin for Daz Studio, then exported to BVH and imported into Poser, so it's quite a journey and I'm frankly amazed that it works as well as it does. This Forearm Side-Side issue is mostly a problem at more extreme values since less extreme values aren't that noticeable. That said, it would be nice if there was a way to fix it.

I'm sending some screen shots of what I am getting. It may be coincidence, but note in the final manually adjusted version I used the Side-Side value to alter the Twist and Bend of the Forearm, and those values seem to make it look right, tho when I tested this with other places it didn't work as well, so it's not that consistent, from what I can tell.

Thanks again!--Tim