I also appears that Poser 4 converts geometry OBJ files to geometry RSR files (not to be confused with thumbnail RSRs) the first time you use them. If you later update the OBJ file, the change doesn't take effect, because Poser 4 already has the geometry RSR file. Pro Pack works directly from the OBJ file, and doesn't create a geometry RSR file. (This is rather counterintuitive, since the two programs take opposite approaches: P4 converts OBJs to geometry RSRs, then ignores the OBJs, while PP converts thumbnail RSRs to PNGs, then ignores the thumbnail RSR.) What this means to vendors is that if you develop in Pro Pack and ship the OBJ files, then later you update the product and ship a new set of OBJ files, Poser 4 users won't get the change unless they manually delete the geometry RSR files that Poser 4 generated from the original OBJs. Since we develop in Pro Pack, and since we have heard that only something like 10 percent of the Poser users have Pro Pack, we have started taking our opening our products in Poser 4, taking the geometry RSR files that Poser 4 generates, and shipping them in the product, along with our OBJ files. It makes the product somewhat larger (but not too bad--most of the size in the product is texture maps), but it keeps the users from having to manually delete things in the Poser directories when the install upgrades. Lynn Grant Castle Development Group