Did you put the mesh into "My Objects" before you used it in your map? o:
Going off of what Star said, make sure the meshes are in my objects, and sometimes, you have to move up closer to see the chain mesh, depending on your rendering system settings, try Moveing closer to the mesh, and see if the chain is there, if so, that's what was wrong Floof, sorry if this didn't help, but good luck Floof.
~ Hiden