Cambridge Audio - StreamMagic 'No Content'

Hi,

Plex running on QNAP NAS for a couple of years with no issues, music content streamed to Cambridge Audio network streamer via their StreamMagic App. Problem is a lot of the albums that were once visible via the StreamMagic app are now misisng and the app says ‘No Content’ when selecting the artist. The content is visible via a brower and the Plex app. Installed Minim server and the StreamMagic app shows all the content that Plex media server now says ‘No content’.

Any ideas on how to get Plex working again?

Thanks
Phil