Changes/Edits save in Planning but don't display in Charts

When I edit a song's ChordPro file in Planning for some songs, the changes save, but when I load the song in Charts, the song shows up with the original contents -- the changes do not display. It's very strange. I've loaded Planning on another computer and verified the changes did save, but when I load Charts on another computer, the changes are still not showing up. I can copy the entire ChordPro file and load it in other software and it works fine.

And here's the kicker -- this is not happening for every song. It only happens about 20-30% of the time.

This has been occurring for months but I haven't reported it until now. I've been trying to look for what may be causing it, but can't track down a consistent set of events.

Any ideas?