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When you say the model didn't appear, was it only on the 3D view, or is its name also not listed on the left panel? If it's on the panel but not on 3D, this means there is a problem finding the meshes.

Are you sure the model was spawned correctly on gzserver? You can check this by running gz model -m <model name> --info.

Also, make sure you are dealing with the correct simulation. In between tries, your GzWeb could be connecting to an old container which you thought was killed, for example.

Also make sure the server is still alive, when you say "the model was there but after restarting GzWeb it disappeared", it sounds like gzserver is not responding anymore, or your new GzWeb is talking on the wrong port.

Hope this helps a bit.