That’s odd. Are you playing local music, or remote streaming (e.g. Pandora, Spotify, etc). If remote, the coverart comes from the Internet, so your openHAB box must have access to the Internet.
Another thing you can check… In debug mode, whenever a track changes, you will see the URL that the binding is using to retrieve the coverart.
I’ve never done it (at least not in a really long time). But maybe this will help…
