Further to my initial report I realised that I had not tried to find the CDs manually using alternative identifiers so I tried to do a find using the Discogs option using Title and Artist manually and lo and behold despite having not rebooted again it found the relevant data record without incident and I added it to my catalogue of CDs. Consequently I then tried to do a UPC search using the Barcode Scanner and an autofind on Discogs and it worked perfectly. I then added another 10 or so other CDs to my catalogue using the same means without incident. So clearly whatever the issue was cleared itself without any further active investigation, albeit I have been using both machines for other tasks in the interim both last night and today.

As such clearly the error report is solved albeit that's not to say the error doesn't warrant some sort of further investigation. but obviously it has a very low priority.