Curious. Both DAZ and Rosity keep removed products available for re-download in your purchase history. I wonder where you got it. Only some RDNA products are available at DAZ. I think PoserPros and 3DCommune stuff is gone forever, unless the vendor moved elsewhere. Verve appears to have left Poserdom long ago.

I've occasionally had odd artifacts around V4's elbows, that might be because there were so many different versions of V4 and her clothing released over the years. Nothing as bad as in your example, though.

Posing without using the side-side dial does seem like the easiest solution to your problem. But sometimes, it just looks better if you use side-side. Less mesh distortion in some poses, even if it's not the way the human arm actually works.