I think you are just doing this incorrectly.
Don't select ALL the tracks, just select ONE. You can't expect to change the song title if you select more than one track.
Then you will have the next/previous buttons available, and you can edit as many tracks as you wish without leaving the 'Get Info' screen.
I don't believe there has been a modification, it has always worked this way.
Thanks for that. I see that when I'm in the Artists tab and then click on an album, the screen "slides down" so I can see the tracks on that album, and then, if I highlight a track and call up its information, I then can see the "Next" button. However, my finding came through this way: do a search for an artist, then choose that artist in the search results. The artist's albums then show. If I highlight a track on an album and then call up its information (Command-I on the Mac), I do NOT see the "Next" button. So the program acts inconsistently.