OK, I apparently have several (I never can remember who made what accept for Stonemason). I've got a lot of his scifi themed stuff like GIS Skyway and such. I've been using a few of these lately. I've had to make several parts invisible and I've had no problems. Tick the box they go, tick the box again they come back. Sorry I wasn't paying closer attention earlier.

It's beginning to look like maybe DAZ did jigger with 8.1 a bit at some point. I'll double check which version of 8.1 I'm using because I'm altogether certain I have the newest 8.1 build. (I don't always update if I'm not having issues)

It also turns out I have a few other sets by Jack, so I'll take a little time later and check those out as well.