Same issue here. MacMini M1, roon core tried to update yesterday but it’s never come back online. I’m trying to find a thread with tips to try. I’ve already deleted the application and reinstalled it.
I’ve also now attempted the “restore from backup process” outlined and while it seemed to initially be working I’m back to the big blank screen with the Roon logo pulsing.
Just a datapoint…I updated my mmm1 running bigsur latest with b880 and no issues to report…database is fine and it’s a big one at 300k tracks and at least a dozen endpoints.
Today we released a new build of Roon which may help with restoring your database. Can you please give this new build a try and let us know if it helps? Thanks!