Now this is interesting. I have made some slight progress.

My original tests of my restore poses were done in P4, they did nothing. I tried one of the restore poses in P6 and it worked fine. Here is the pz2:

{
version
 {
 number 4.01
 }

figureResFile :Runtime:Geometries:DAZPeople:blMilWom_v3Lo.obj

actor lThigh
 {
 storageOffset 0 0 0
 geomHandlerGeom  13 lThigh
 bend 1 
 }

actor rThigh
 {
 storageOffset 0 0 0
 geomHandlerGeom 13 rThigh
 bend 1
 }

figure
 {

 }
}

Although the restore pose workes in P6, my pose to replace the thighs with boxes crashes P6 if I load the boxes with 'bend' on. That pose did not crash P4. Diffrent Poser versions seem to handle this stuff diffrently :(

With so many versions and service releases out there, things could get complicated.