When I first hit the problem, with a free version of Poser 3 given away with a computer magazine in the UK, I ended up taking the exported .obj file and importing it into a spreadsheet. I don't recall the details of what I did, there are various import options, but each line of the .obj was a spreadsheet row, and the various numeric values in each section, X, Y, and Z, were in a distinct column. Once I figured the offsets, which was a simple Y-displacement, I could recalculate the values, export as text, and it worked. Though I may have had to slip it through UVmapper, I don't recall. It was only after I did all the work that I discovered the export option. Incidentally, I've seen some morph targets which are just the vertex information -- no connecting lines. Looks odd in a 3D mesh editor, but that seems to be all Poser needs. If you go the spreadsheet route, you could remove a lot of the file. Come to think of it, you could probably extract the block of numeric data in the text editor, use something like AWK to apply the correction, and reassemble a minimal morph target file.