A year ago, there might well have been some crash bugs :).  If you're willing to try it again, and you are using 8.1, then you'd need to use the R7.3+ version.

Anytime you enter/exit the Setup Room (or use the Group Editor) in Poser and then save a .cr2 file, Poser writes out a new .obj file (look for it in the same folder as your .cr2 file).  If you haven't used the Group Editor, then what I normally do is delete that new .obj file and edit the .cr2 file to point back to the original mesh (over in the Geometries folder, where it belongs).  If you did use the Group Editor, and changed some grouping or material settings, then you'll need to use the new .obj file.

As for other numbers changing drastically, if you Export a .obj file from Poser, it will add Vertex Normals (which may not have been in the original file).  It might also change the vertex location values, depending on what options you use when exporting.  Other differences are likely due to the method used to write floating point values to a file and a few other file-formatting differences, but functionality is the same.

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