If i remember correctly when i first installed mp3tag, this program added 'mp3tag' menu in folder and mp3 files right click menu. But this menu somehow disappeared from mp3 files right click menu after i uninstalled a program that was associated to open mp3s. I notice this will also happen if file association for mp3 changes. I think if there's an option to hide/show this menu in right click, maybe users can easily fix this problem.
p.s: i suggested a feature to show/hide column few weeks ago, and im very happy to see that it's been added in mp3tag. Thanks for much! Donation is coming