If you had to make any changes at all to either the layout of the UV map or to create mapping coordinates for the UV map itself then you MUST save the .obj as well since the map will not work correctly with the old file as the information is now different. Example 1: I create a prop and save it as a 3ds file (obj is not available in the app I use). I then import it into Poser as a prop, export it as .obj for mapping, map it, and then use the map on the original prop. It won't work. I have to save the .obj as the original .3ds doesn't use the same sort of mapping information as .obj. Example 2: I want to make a new map for Posette so she can use Vicky textures. I pull the posette obj into UV mapper, make the changes to the map and save it. If I try to apply the new map to Posette, they won't work because I didn't save the .obj file with the NEW mapping information encoded. I'm trying to use the new map on the file with the old encoding that tells it where to apply the parts of the map. That help explain it? Kate