An old (but still very much in use by me) Denon DN-500AV Processor which was working fine with AirPlay 1 until recently has now stopped working.
Build 1410 on both server (ROCK) & client (iOS).
I can still AirPlay to it direct from my phone, but although:
- Roon appears to be connected
- The signal path looks as expected
- The little ‘spectrum analyser’ icon for that device, under the zones menu, is moving as if music is playing.
- The play and pause buttons work, but the playback position bar doesn’t move, it just stays at 0 (or wherever I drag the play head to).
I don’t get any audio 
I’m not sure if this is relevant or useful, but the processor used to appear as Denon:[DN-500AV]. But since the update it has (Denon,1) appended to the end of that string.
(have tried re-re-enabling the zone in Roon, loaded the defaults, restarted the processor, ensured nothing else is connected to it via AirPlay etc. but still no luck - was working without issue until recently)
Screen grabs below
