I also missed the P5, but I heard it had its own quirks. It would be interesting to know how your home models perform in different versions.
The behavior was dependent on the model really:
Military Truck -
One was a military truck I needed, and at the time there weren't any close to the style I needed available for Poser (there are several now). I had a Renault military truck that was close to what I needed in Lightwave, so I decided to convert it over I used Carrara to convert it to grouped OBJ and bake the LW procedurals to texture images, then loaded it into poser and rigged the wheels to turn, and the back hatch to fold down). It took some time as it was the first mesh I ever rigged in Poser (using Poser 4 Pro Pack). I had it working well enough in P4, but when I moved to P6 and P7 and loaded some of the old PZ3s with the truck, or loaded the truck from the library there were issues. The back hatch did not load any longer. Spinning some of the wheels caused the polygons on the treads to blow out and enlarge.
Handgun-
Another item I did some work on with morphs and geometry swapping in P4 was a handgun that came in a free pack that used to be available from a certain brockerage. It was a revolver, but it was a static prop (all of the weapons in the pack were). I wanted the trigger to move, the hammer to move, and the cylinder to turn. I wanted to do this with a combination of Morphs and rigging. When I finally had it working in P4, later I tried loading it to P7 and moving either the hammer or the trigger seemed to move both, and turning the cylinder one way caused it to grow, and turning it the other way caused it to shrink - very frustrating.
I have not done a lot of base rigging though. I used to set up a lot of ERC on pre-rigged figures. Though it sounds like what
@3dcheapskate is doing is way beyond my meager skills.
Yesterday I dicovered a backup of my old Poser 8 ISO (I never actually used Poser 8 because I ended up with Poser 9 digital for a bargain price before the Poser 8 CD arrived), so I installed it. Unfortunately it went the same way as my Poser 9 reinstall a couple of days ago - it installs okay, but when I run it the GUI starts to display... and then it crashes before the GUI's up.
So I'm limited to testing with Poser 6, PoserPro 2014, and Poser 11. Since everything seems okay with my bookstack figure in PP2014 I've decided to create the CR2s from this rather than from Poser 11. Over the past day or two I've got partway through the process, luckily just a short partway not a long partway, before spotting a problem I'd overlooked. This has happened a couple of times, but I think, fingers crossed touch wood, I've got past that now. So just a slow, tedious, but careful process now to try and avoid doing something stupid again...
@3dcheapskate This sounds all too familiar to me. May I ask what version of Windows you are on? I know Flash and Internet Explorer caused all sorts of library and display issues on Poser versions 8, 9, 10 and their respective Pro versions (2010, 2012, 2014). I may or may not be able to troubleshoot - first I need to see if I saved any of those troubleshooting pages before SM took everything down.