I tried making TheCube_7 use an external geometry as I thought perhaps internal/external geometry may play a part. But it doesn't seem to make any difference

{
version
    {
    number 10
    }
prop TheCube_7
    {
    storageOffset 0 0.3487 0
    objFileGeom 0 0 :Runtime:Libraries:props:TheCube_7.obj
    }
prop TheCube_7
    {
    name    TheCube_7

External Name = TheCube_1 (Internal Name = TheCube_7)
External Name = TheCube_2 (Internal Name = TheCube_8)
External Name = TheCube_3 (Internal Name = TheCube_9)

---

The 3Dcheapskate (also available in DAZ and HiveWire3D flavours) occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.