Attached Link: http://www.uvmapper.com/

On the first one, try running it through UVMapper and see if the all the Material Groups show up in the Select-Materials Menu. If they do, exporting this from UVM may fix the problem. If not I'd have to see they file to tell what's up. To get the parts of an import, select the Object, hit the group button and select New Group. Give it a name and then hit the Spawn Props button. Now, in the pop-up under the main window (the right down arrow) under Props you should have all the groups plus the original "mono" group. Select the mono group and delete it. .3DS works well on both platforms and Poser's importer is pretty good on the Mac. I have had it crash when a .3ds file has camera, lights, etc info which Poser can't read.Can you export with just the vertex, groups and UV data? HTH- Dan