If I enable the “use title cover” setting in a media source, does that only apply to newly added (or changed) media? When I enable it, a short sync is triggered, but as there is no change in my Kodi lib, the sync quickly finishes. I am not sure if title covers are synced in the background though…
You mean the Kodi provider option Prefer song thumbnail? (Don’t do drugs:p)
Then yes you need to force a full sync (long press the sync button)
Yeah, sorry, I back-translated the option name from my own translation 
But that is the one I meant. I will try full sync now.
Worked, thanks! Lalalala 20 chars