It's not likely that the program is corrupted. The problem can occur in the process of working on and saving/writing files.

I had this happen one time and nothing I seemed to do would fix it. My fix was simple. I first copied the chords in the song..... highlight the entire song and select copy.....

then I opened a new project and simply pasted the chords back in and the new one worked perfectly. Give it a slightly different name and save it. Reopen it to test. If everything is fine, simply delete the old file from the computer.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.