Unity editor won;t launch on Mac

I’m an academic, and use Unity on my school issued Macbook. My computer suffered a battery failure a few weeks ago and I was issued a new. 2018 Macbook. It came pre-loaded with Mojave, and I used my backups to restore my system. The problem is, now Unity won’t launch. |'ve tried removing all Unity traces from the system (Library, prefs, etc) and re-installing three times, but if I click on the app, the Finder window dims briefly and nothing happens. I can’t even find any logs that reference an attempted start, so I have no way of knowing what might be interfering. I’m using the latest system update, and the latest Unity. Any suggestions or answers much appreciated.

#bump 2018.3 doesn’t help