I've just started trying to rig my own models in Poser.  The results  so far isn't so great.  when I try to pose the model the mesh splits apart.  I'm not quite sure what the problem is.  I've tried a couple of tutorials over at Daz, but they sort of lost me about mid-point.   Looked for Geep's Tut' but the website isn't pulling up.  Any suggestion?   Be nice - this is my 1st attempt after all : )

I assume the split occurs at the boundary between groups? Two possibilities, if you have duplicated vertices at the boundaries. Either the vertex coordinates aren't exactly coincident (down to the last decimal point), or your CR2 is lacking the appropriate weld statement. That may not have made much sense; if you give us a bit more detail about how you grouped the mesh, and how the rigging was done, we'll be able to help further.

It maybe that it's lacking the weld statment.  I didn't do anything with the weld button.  So That maybe it.  Thanks!  : )

It looks like you have the collars and neck meeting, with no parts of the chest between them. That won't work, as any given body part only deforms its own direct parent, not its siblings or grandparents. If you could post some screenshots showing where the mesh is divided, that would help a lot :)