Wow, I had almost forgotten about this nightmare. The good news is that I eventually did solve the problem. The bad news is that I don’t remember how. Try this on your client machine:
- open your “Terminal” program (/Applications/Utilities/Terminal);
- in your home directory look for a file named “.rmembid” (cd ; ls -a .rmembid)
- if that exists, renamed it (mv .rmembid .rmembid.bak)
- restart Roon.
I am not sure if this is the correct fix. I remember that when I found the solution, it was a very easy fix and I was extremely angry with Roon Support’s failure to tell me about it.