It's just with you saying you'd try reinstalling V4 back into Daz Studio it confused me.

I would reinstall her into P6 just in case something got corrupted somewhere along the line but I would do it after you have done the last service release for P6.

Hang on a sec.  Your V4 works correctly in P5 but has issues in P6?
If this is the case I suspect the problem is with your P6 Runtime - potentially even your P6 installation.  
Now you have unchecked binary morphs the scene issue should be rectified for you nicely.
Once you have got you P6 updated I would link the P5 Runtime to your P6 as an external Runtime and try V4 from there and see if you have the same problems or if they are miraculously ironed out.