Thanks for pointers. Both servers are local, both have Preferred but I have realised that only one has a Music library - doh!Is the missing server remote, if so, that is probably why. If it's on your local network: do you have SSL/HTTPS set to "required" (as opposed to "preferred") for this particular server, because there is/was an issue (soon to be patched, if not done very recently) with WiiM accessing Plex via HTTP only.