Hi @Stuart_Hastings ----- Just wanted to touch base with you, as Mike mentioned the thread has been unlisted so any information shared will not be available to the public 
After you have provided the details of your setup (as seen here), I would like you to please follow the instructions listed below and upload a set of your logs to our servers. Let me know when the upload has completed and I will be sure they reach our developers in a timely manor. Thanks!
To manually grab logs on OS X:
- On whichever machine runs your Roon Core, open Finder and click Go in the top bar
- Hold down the Alt key to unhide the Library folder
- Click the Library folder
- Find and open the Roon folder (or RoonServer, if applicable)
- Right click Logs, then ‘Compress Logs’
- Rename the files to include your user name
- Upload the file here using “alpha” (no quotes) for username and password
-Eric