Changing movie name or "Pretty Name" isn't working

Can anyone tell me how to get the new option for changing the DVD name to work. That and change to “Pretty Name” don’t seem to work.
I have a couple of movies that I would love to rename to the the English version of the title rather than the french version that it was changed to in getting the movie info from imdb. I have tried typing in the new name but when I go back to the menu to check it hasn’t changed it at all.

What other steps are needed to make this work?