First of all: Seriously, Sonos? I pay a premium for a cheaply manufactured premium marketed product, and I still need to ask your other customers on a forum for help? Where's the instant chat? Where's the 24/7 international support phone number?
Not for the other problem: After updating to version 7.2, I can no longer play music from the library on my NAS. 'Radio' still works fine, but any song I try to play from my library results in an error: "Unable to play 'TITLE' - access to SERVER denied".
The credentials are still valid. I can log on with them and access my music from a workstation just fine. I have tried a second account, and I have tried to re-add the server using the Sonos controller on my Mac, but even that results in access related errors. I have tried forward and backward slashes, a dns resolvable name and an IP address, but none of that matters.
My NAS running FreeNAS and this setup has been working well for a long time, before updating the Sonos system.