See attached picture. This anomaly only happens when you are typing a title in the bottom title box when looking for a song.
I was unable to reproduce this issue. I did the following:
When I do this, nothing changes in the layout. Am I missing anything? Also, is this while running OS X 10.9 only?
Here's a video screencast of what I'm doing. Pay close attention to the check boxes. It's only doing it on my Macbook Pro 10.9.3. I tried it on a Windows machine and it worked fine. Hope this helps you narrow it down. Of course, I don't think this affects the functionality of the program at all, it's just a UI bug.
http://www.youtube.com/watch?v=E8h0B7lMigE