Hey @Graham_Cox,
It’s great to see you on the Roon Community! You have my sincerest apologies for the delayed response here, we’ve been dealing with a higher-than-usual volume following our release and we’re working as quickly as we can to get back to everyone.
Following up on this thread, I wanted to check in to see if you were able to get things sorted out? @Robert_F is pointing you in the right direction with creating a fresh backup, and then downloading the MacOS Roon file from the link they’ve included.
I’ll be monitoring this thread for your reply 