I've seen this problem. I've seen it so bad that the OBJ file get to be 3X the original size, in fact. I never knew what it was, but I strongly suspected it had to do with materials. In Max, at least, materials don't work like Poser materials. When you apply an material to one group (or part) of a multi-part object it actually is one "Max" material for the whole thing, with sub-materials (which are the Poser ones) inside it. Every group gets the same "Max" material, which will then contain Poser materials that (perhaps) aren't actually present in that group. When you attach all the groups into one, and later regroup them, I always suspected Max was adding all these submaterials over and over again, even the unused ones, as when I'm working on a project like Glamorous Jessi the OBJ file gets to huge size, like 30 MB, compared to 9Mb after fixing her (I do try and fix 'em). Other modeling programs might do it too, I suspect, if OBJ isn't their native format. I do know how to fix it though, I'll have to see if MAKEOBJ fixes it also, it might be easier. Incidently, a good test for this would be load it in Poser 4, if the RSR file is much bigger than the OBJ version it is probably fragmented, or has other wastful problems (like too many decimals). Maybe this is why Poser 4 made RSRs? Maybe CL should have kept that in? ;-)