Crash when opening any projects

Premiere 14.7, and 14.5 on a MacPro trashcan running Catalina and now Big Sur crashes when opening any projects...  Big, small, old or new.  Disk permissions have been repaired.  I've reinstalled Premiere, deleted preferences, removed plugins, prayed to demon gods, removed ram, reinstalled OS, removed peripherals, replaced cables, turned off icloud, deleted fonts, prayed again to demon gods and still Premiere locks up when opening a project.  Plug the drives into my 2014 MacBook Pro and everything works fine.  Go back to the trashcan and it crashes every bloody time.  Yes I have given Premiere disk access in Security and Privacy.  Yes, I've tried disabling Mercury Transport.  Yes I have deleted cache files.  I've run as metal, software only and yes I have prayed to demon gods.  

The nature of my work is that I'm constantly jumping between projects, going back to something done months or years before.  A quick change here, and long session there.  I don't want any moral posturing about not updating the app or OS during a project because that's simply not how the world opperates.  I'm just really tired of this crap.  For years I was using Flame and Smoke for the bulk of our work.  It was expensive but it worked.  Adobe is about to push me back to Autodesk.