Air (Ethernet) Problem

[ogs]

I am not big fun of Roon (yet) so still looking for ideas for solution.

I am not suggesting you use Roon as a player, just as temporary trouble shooting. Roon is the only program that has an AIR implementation outside of Devialet (and better than Devialet's). Just copy one or two music tracks to a new folder and point Roon to use this as it's music folder. If ethernet AIR does not work with Roon either, you've got a network problem to solve.
Is your PC on ethernet or wifi by the way?