There seems to be a permanent link between mesh blockFLOOR.MESH and mesh blockFLOOR.MESH.003.
I have no idea how, the first was appended as a new block from your sample furniture file. There is no physical connection between the two meshes. Texture slot 01 (IMVU) seems not want to be changed in any way. Manual XRF does not work on it. I can add textures but they won't affect the mesh.
I guess I need to use a texture which does not look bad at both blockFLOOR.MESH and mesh blockFLOOR.MESH.003. Not a perfect solution but I can live with it (both are wood). I can now edit the phone, the phone box, the bed and the pilar with arm rest (also wood). I think it will look ok, but I still would like to once find out what the problem is, because it's giving me a head ache.
And yes, they are nice meshes, the Star Wars stuff is fun to do. I loved doing the Max Rebo band music thingy.