Roon app not opening on iMac with M3 chip after Sequoia 15.1.1 update (ref#D1PIVG)

[Suedkiez (Just a fellow user like you)]

Not sure if it will help (it often does with macOS 15) but try this as a first step

Roon 2.0 build 1480 not detecting audio devices on Mac mini (ref#LKGPIF)

macOS 15 messed up security settings for quite many people, leading to device discovery issues. Lots of threads about this on the forum. Try this, it usually helps: Navigate to macOS System Settings > Privacy & Security > Local Network , and make sure Roon is allowed. If it is already enabled, toggle it off and on again. Then reboot your Mac, and see if the same issue persists.