Hello @James_Ockers,
Thank you for the detailed report and for including the logs — that’s very helpful.
We’ve identified the System.NullReferenceException crash on macOS 15 (Tahoe / Sequoia) as a known issue that affects the current production build.
A fix for this issue has already been included in the latest EA build.
Could you please update your Roon installation to the newest Early Access build, or alternatively wait for the upcoming production release which includes this fix?
Once updated, the Roon app should launch normally without crashing on startup.