I have a semi-detailed mech model with a simple walk animation in Maya via a bound smooth skin. I have deleted non-deformer history, and froze transformations prior to binding. When I import via FXB or directly into Unity, the mesh disappears. If I remove the smooth skin (and therefore animation), it imports just fine. What potential issues could cause this? I have read that animating vertexes will. I'm not aware of having animated vertexes, but am also not sure of a systematic way to check (if I select all the vertices I don't see any keyframes). I'm thinking of rebuilding my skeleton, or perhaps using a rigid bind, but that would be time consuming and I would like to understand the root of the issue. What troubleshooting steps would be recommended?