Mac version only tries AFP for NAS files?

Not sure why/when, but recently mp3tag on mac is trying to open all files using AFP.
My NAS connection (working for everything else) is using SMB. It asks for the password to access QNAP (AFP).
BTW I am using Catalina, with no option to upgrade!

FYI my QNAP work ok with all other Mac apps, and from windows it works fine using Mp3tag (so I can work there - but means moving rooms to change tags!)

Are you using File → Open... or ⌘O to open the files or does it happen when using Mp3tag differently?

⌘O or drag and drop
I get a dialog box "enter your name and password for the server qnap2(AFP)"
password does not work, so I click cancel (1x for each file) then they "import", but tags etc. cannot be edited

Can you connect to your NAS via Finder first? Mp3tag doesn't decide if AFP or SMB is used, but instead transparently uses services provided by macOS.

Mac already connected to NAS, all other applications (inc finder) can see, and edit files on the nas....it is just mp3tag that is doing this odd behaviour
(and the nas is not running AFP - I did try enabling it to see if I could get that working, but no change)

Can you please try the following:

  1. Close Mp3tag
  2. Open Terminal.app
  3. Enter these four commands:
defaults delete app.mp3tag.Mp3tag LastOpenDirectory
defaults delete app.mp3tag.Mp3tag LastOpenURLs
defaults delete app.mp3tag.Mp3tag NSNavLastRootDirectory
defaults delete app.mp3tag.Mp3tag SecurityScopedBookmarks

After that, open one of the folders (not individual files) from your server in Mp3tag. Does this change anything?

That seems to have fixed it!
Many many thanks!
..... is this a known issue, as I did not find this fix anywhere in my searches (I always try to search forums etc and self fix before asking "daft" questions)

Excellent, that's great news!

Based on your description I was assuming that sometime in the past, you or Mp3tag tried to connect to your NAS via AFP.

Mp3tag keeps track of some paths and secure bookmarks via the defaults keys listed above. Removing the internal caches ensured that Mp3tag doesn't try to reuse any of those when loading files and folders from your NAS.

This was all guesswork and a first occurrence — so it's not a known issue which you should have been able to find out by yourself.

Thnak you so much. MP3TAG is an excellent piece of software, and support like you have just shown, takes it to a new level.
Shame the "big boys" don't have the same level of support