So right after I do what you suggested, I open mp3tag, click on the "change directory" button, load the directory into the large pane on my right, hit Ctrl+A to highlight and select all the files, then hit ALT+2 and it should enter those filename sections into the tag fields on my left. Correct?
Sorry, but after it flickers for a couple of seconds, I go to highlight each filename and the tag fields to my left are still empty.