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What kind of missing items? Music/streaming choices, or regular UI elements? S1 or S2? Can you provide a screenshot, and tell us what you’re expecting to see?
So, it is speakers you’re missing, and from the S2 app? Have you tried a network refresh, by unplugging all Sonos devices from power, then rebooting your router? Wait two minutes after the router comes up before plugging back in your Sonos devices.
Which devices are missing? What router do you have? Can you explain your network to us?