If I import an object that is already sized correctly for Poser, then the center is always at the center of the object.  If I build it normally, where it is way too large for Poser and must be resized, then the centers are out of sight.  I have to enter numbers in the Joint Editor to bring them where they can be seen.

I then grab the crosshairs, from an ortho view,  to set it exactly.
Tip: Use Outline display mode to see what you're doing (Ctrl+2, I think).

It seems that Poser assigns the centers when imported, but can't preserve their relationship to the object if resized.  Any way around that?  I doubt it.

John