Can't get rid of unwanted genres

I realize this problem has been discussed many times, but I have tried all of the suggestions unsuccessfully. I have many sub-genres that I can't get rid of, illustrated by this screen shot.

Steps I have taken:

  1. Used < blank > to clear genre field.
  2. Eliminated APE tags.
  3. Configured the Tag Panel to only show user defined genres.
  4. Changed or added genre field in Extended Tags.

When I take these steps Mp3Tag shows the genres correctly, but no matter what I do, when I look at the directory in Windows Explorer the bad old genres have returned.

What am I missing? Thanks.

Please show us a screenshot from a file where the "bad old genres have returned" in Mp3tag and it's View -> Extended Tags window.

After I finish blanking the genre field and changing the genre to one of the user defined genres, it looks right in MP3Tag. But if I close MP3Tag and go back the the finder, the first screenshot I posted shows incorrect genres; my changes don't stick.
This is again what MP3tag shows for the directory:


And this is the Extended Tag panel for one of the files with incorrect genres despite my changes:

What does the extended tags dialogue look like after you have made the changes?
Right now it looks like every program shows accurately what can be found in the files.