Have you checked to see if Poser is creating a .mtl file for each of your .obj exports? Why not try the .pz3 import, and you shouldn't have to worry about the textures not being found. If Vue 4 isn't asking you to locate textures with .obj, then something has gone wrong, like either there's no .mtl file in the same folder, or your installation has gone bad, and you might want to reinstall. You say it was working before and just suddenly stopped working?