I have strange issue with Ropieee + Yellowtec DDC + Genelec speakers.
It works ok when I use generic firmware but then eg
Airplay doesn’t work.
It’s described in Yellowtec documentation as USB Class 1 Audio compatible.
Newer firmware supports Class 2 Audio and it worked 1-2 days but stopped and after play no time progress in Roon UI and no sound. Not sure where is the problem. It would be very helpful to know sth more before asking Yellowtec support 
Not sure where is problem. DDC or Speakers maybe (I use AES connection)
Debug info:
ad2e9b047e2cb81e