Just as a note, I am still having no luck with this.

No. Don't delete your cover, it isn't necessary.

Look at your screenshot. In the Album Art tag you have a few Unknown Album Art images (the CD case). Click on the first one which shows as type - not specified. This will highlight. Now click on remove. Keep doing this for all the others, which are showing as type - front cover, until that Album Art view is completely blank.

Now right click on the Album Art Window; Select Add.

Navigate to the image you want to use. Ensure that 'link to file' and 'apply to all tracks' for that Album are checked. Say OK.

This is about getting MM to see your cover (and only your cover) in the tag.

NB I believe there are limitations in saving to tag with FLAC files, so you have to link to the file image. Someone else maybe able to comment on that better than me.

I am kind of slow....
Am I supposed to erase all album art and start again or what???

Looking at your screenshot, I've had this happen to me in the past. The problem appears to be that, somehow, the NoAArt images get queued up as Album Art covers to the tracks.

The immediate solution is to remove all of those stored covers.

It's possible that your image is at the bottom of the queue! But even if it isn't, a good clear out will enable you to assign the actual image that you want.

Bump for me

Here is a printscreen of what I have going on. I added the JPEG you see in the "Best of Album" using the get info from amazon feature in MM. I had the "apply to all tracks in album" option ticked, but Album art does not show up in the "currently selected" setting or the "now playing setting.

Do the tracks have an album name or is the album field empty?

I use the amazon get info feature and the .JPG is saved to the folder correctly, but when songs are opened up art doesn't show. Also when I tick apply to all songs on album tick or whatever it is for cover art it doesn't apply correctly.

Besides this I like most everything so far,

Is there a way to have MM go and fetch album art for whole library at once??

Thanks