I’m running the latest Local preview (2.3.1) on my MacBook Pro (2015). I had the current release of Local already installed, so I copied over it and then added the Port add-on. Local indicated it was restarting and seemed to start the process but then hung. For a while I could see there was still CPU activity from Local in Activity Monitor, but eventually this went away and yet it was still hanging. I closed Local out and reopened it…took a little while to start up but seems to be working fine now. Just FYI, in case anyone else experiences a similar hang after adding the Ports add-on.