If you open Swarm Agent is there anything that is printed in the Log tab that would indicate here that Swarm Failed to kick off? If so can you screenshot the log or copy the text that is there and attach here.
At the moment I’m out of ideas as to why this would happen when you copy a project to another computer and back. I’ve not had that happen in my experience yet with any version of the engine.
Would you also be willing to post a link to a simple blank project with a couple of assets placed (cubes, spheres, etc) that is after you have copied it and it gives the swarm failed issue. I can see if I get the same with that project and maybe try and diagnose from there. Beyond that I’m not sure I can reproduce locally the issue you’re seeing.
Thanks.