It is hard to imagine a worse “upgrade”. Today, it cannot play anything. I already copied my entire music collection to a new NAS, in accordance with that new requirement. The Sonos controller can acces it. It built a library representation, but now cannot open that. If I use Folders instead, it can find the files, but fails to play them.

Far from the only problem. Now the web app (which they swear by), can find only 1 of my 7 speakers. The mobile apps (iOS, iPhone and iPad) identify the other speakers, but cannot switch focus to them. They check them in the selection interface, I hit apply, they highlight them, I pick music to play there, then they play it on the earlier selected speaker (which I deselected), and the selection interface shows only that speaker selected, the ones I just selected no longer selected.

This is the worst software I have ever seen anywhere. Software fiascos are not new to Sonos, based on over 5 years of personal experience. But this one raises the bar on dysfunction to a previously unimaginable level.