When we used our HDX for ripping CDs we had a few "difficult" albums. Mostly Japanese imports but sometimes quite popular albums that you could buy on any high street. It was not predictable and could not always be fixed using the front panel or DTC. Nor was it common. For reasons unknown, changes made just wouldn't take.
I was also downloading music which often needed the tags cleaning up and pipping DVD-As, so tactics were in development around the whole tagging issue which gave me tools.
In your situation, where edits won't take, I would take the album out of the music store and put it in another share. If you're not running shares I'm sure it will work if you take it off to your local disc and put it back when tagged. Use dBpoweramp Music Converter to strip out all tags. Then use dBpoweramp Tag Editor to put the tags you want into the files. Everything can be bulk tagged apart from track title and track number.
Always worked for me, although I did run other shares parallel to the music store, so strictly speaking I never changed any information in the Naim ripped music store because the albums went back into a different share.