I just tried selecting Airplay in Control Center on this Mac and same result.

Nothing else in my environment has changed. That worked fine with the Mac prior to the 12.4 upgrade. This problem is the other way: play something on the Mac and toss (airplay) it to either of these 2 Sonos speakers or both of them. But, if I'm grasping that right, that would be for tossing (Airplaying) something from some other source to the Mac. Airplay Receiver in Sharing is already on and checked. If someone else has Sonos and has upgraded to 12.4, could you please try airplay and let me know if it works for you or if it does the same? Thanks for any help. So this seems to be narrowed in on Apple Mac Airplay-to-Sonos and I can recreate it over and over by simply booting up the Mac, immediately opening Music, clicking Airplay button and choosing either speaker in the list. Lastly, I tried selecting Airplay in Audio Settings 'notification' instead of the Music app and same result: freeze, black, pink, reboot. I presume it likely uses Airplay itself or perhaps Sonos has coded its own for its app? I also decided to rule out the Mac music library by connecting to that within the Sonos app and trying to play my own songs through the Sonos app. Opened the Sonos app on the Mac and it connects and works just fine. I also tried using the iDevice Remote app for Mac-to-Sonos and same result as doing it directly from the Mac: freeze, black, pink, reboot. Selecting other airplay devices like my receiver still works, so this seems to be isolated only to Mac-to-Sonos. So only this 'latest & greatest' Mac upgraded to 12.4 does this. 5 upgraded) and Airplay to those same speakers works normally.

tested from another Mac running Mojave and Airplay to those same speakers works normally.

made sure speaker software was up to date.

(well this has) rebooted the Mac (several times).

I've tested this over and over and same every time. Now, when I select either Sonos Arc or Move, within about 2 seconds (no sound from Sonos), mouse freezes, screen goes black, then flashes full-screen pink, then reboots. Prior to 12.4, selecting the airplay button in Music and then choosing either of my 2 Sonos speakers worked exactly as expected.

Hello, could someone else try this so I can know if this is only a brand new problem for me or a new problem for some/many/all?

How to airplay from mac to sonos