Well, the T-Rex is about 14MB; DAZ's Michael and Victoria are each less than 4MB .... I can't really say. Some experimentation might be required to discover Poser's tolerance for high-res meshes, if that is the cause of the problem. It might also have something to do with the nature of the geometry itself. Are you using triangles, quads, or pentagonal polys? How many groups or materials? Every program has its limits. Unfortunately, I don't know the limits of Poser 3.