Hello @Iacov, sorry to revive an old thread which might be very well represent an already solved issue.
I was looking for Symfonium looking for other people having an issue with the cover art, but I just found everything seems to be working, at least using the current releases of both Moode and Symfonium.
Anyway, I can start playback via Symfonium to Moode (using the cast button) from my subsonic library. The only requirement is that the UPnP renderer is up and running in Moode in UPnP-AV mode.
I was looking for Symfonium looking for other people having an issue with the cover art, but I just found everything seems to be working, at least using the current releases of both Moode and Symfonium.
Anyway, I can start playback via Symfonium to Moode (using the cast button) from my subsonic library. The only requirement is that the UPnP renderer is up and running in Moode in UPnP-AV mode.