From your screen captureI notice that it is not licensed. It must be partially hobbled, or few would purchase it.
Perhaps the hobbling inadvertently introduced instability? It’s a small shop and is very responsive to feedback, and all platforms are in active development.
I’ve recently added to the SongBook ChordPro application a trove of over 1000 beautifully crafted ChordPro files (in styles of music I like) that I found on line (see post FREE downloadable ChordPro formatted songs ) and both the iOS and OS X apps are stable and format in the same manner.
[now I need to up my skillset to be able to play them]
I use the {pause:} directive frequently, particularly above the sections lacking lyrics so that it scrolls appropriately. Karaoke is a big plus for me too.
Check out how the guy in the link above formats his files, it’s for ease of use and gigging. Really makes sense to me.