Hey, so my Chromecast (first gen) just updated as did my Spotify app on my Moto G (third gen) running Lollipop. From what I can see I should have the ability now to cast what's playing in Spotify but nothing is appearing in the device list within the app. Anyone else having this issue? Everything else is casting fine, I can even cast my screen and open Spotify and cast the sound that way (but that isn't really ideal).
I have the exact same problem and i have the next gen Chromecast (2015), which should work with Spotify out-of-the-box. Incidentally I also have a new Moto G (3rd gen) with Android 5.1.1 installed. Maybe there is something with the phone? No ChromeCast button appears in the UI and neither in the Connected Devices section.