Batch change media kind not working

Many times in the past when I have imported a bunch of movies into iTunes I have wanted to change all of their Media Kind from the default "Home Movies" to "Movie".

Selecting all and changing the Media Kind for all files has worked for me many times in the past, but trying it now with iTunes 12.4.3.1 it simply ignores me.

Changing them one at a time still works, but that would be too painful a process to consider.

Has anyone else had any luck with this?

Thanks,

Andrew