Report your bugs here - if someone else has already mentioned the same bug, just add on to their post with as much info as possible to make the hunting easier.
When in "Edit Movie" (Movie>Edit...), I find that I can no longer select from a side list when an IMDB search finds multiple titles.
I can still see the direction to "Select the Title" at the bottom of the Edit Movie window, but there is no movie list to the left or right of the window. Also the arrow and list icons are greyed out so I can't force them to pop out either.
This appears to be a new bug since 5.4, and still existing in 5.4.1.
Thank you so much for the bug report. Had failed to catch this El Capitain issue, it's a timing issue with the drawer. Now fixed in the beta and official release.