LithUnwrap import/export OBJ files with no problems, including OBJ materials and textures. It's totally compatible with Poser and works fine for me. You just can't load anything over 65535 vertices or 65535 polys. This is limitation that the program sets. There are also limitations on the number of groups and materials you can load. It is not a bug. Besides, I think anyone trying to UV map such a huge model should get a program that handles high poly models. If you read the webpage, the program is for low poly modelling. And it looks like it does everthing UVMapper does, and everything UVMapper Pro does too, and more! And it's free! What more could you ask?