For example, Victoria 3 model not changing in display mode when applying DAZ Morph Inj (both face and body)?

Some folks have reported that pointing P5 at V3 in a P4 runtime can have problems with the INJ & REM files. The solution seemed to by to copy over the Libraries!DAZ folder into P5 so the internal paths work correctly (just the !DAZ folder directly under libraries and it's contents). Hope this helped....

That's what I did, and along with that, I don't inject in P5 any more at all. I set up in P4 and get everything right then open my pz3 in P5 for the remainder of the work after removing the injection.

I only have P5. The only thing I've noticed is that the injected morphs do not show up right away. However, if you switch to another part of the body and then go back to the part you injected, there they are! Figure that one out! Another little "glitch" occurs when you change directories....the hourglass won't go away until you hover your mouse over the image :) P5 is an adventure....that's for sure! :) You never know what's going to happen next!