I run Roon server on my headless Mac mini - and i just restarted the machine as Roon was saying my HD was unauthorised after the latest update, and… while I’m now reconnected and playing music again just fine, my Mac now has the Roon desktop/remote app open and running. Is this a glitch or a new feature (i.e., no Roon without the app)?
Just close the Roon UI app. Roon Server will continue to run. You might want to read the Release Notes for more information on the changes in this release.