Just upgraded to MM4 and found out that there is a small, but annoying difference between MM3 and MM4:
When I select multiple songs, i.e. an entire album, and press Alt+Enter to edit the track properties, I can shift back and forth between the track property windows of the individual tracks using Alt+Right/Left Arrow.
Now, in MM3 when I did this, the cursor would remain in whatever text field I was in, so if I was editing, say, the Title field of Track 1 and pressed Alt+Right Arrow, then the cursor would be ready in the Title field of Track 2.
In MM4, however, switching to the next/previous song resets the focus, and the cursor disappears from the text field that I was in, so before I can enter text in the new song's Title field, I first have to tab my way there or place the cursor there with the mouse - a much slower operation than before!
Case in point, I have just ripped a CD that was not in the freeDb database, so I had to copy-paste all the song titles manually, which before could be done fairly quickly, but is now quite tedious as I had to refocus the cursor to the Title field on each new song.
I'm hoping this is a minor bug to fix, but nevertheless, pleeeeease fix it soon!