Play ratings not saving in custom playbook

Three times I have gone through formations rating plays. I exit custom playbook, save it to a file, and then the ratings are gone when I open it again (or when I play a game and the plays are not suggested).   
  
After I noticed it, I went in and rated plays in one formation, clicked back to choose a different formation, and found that all the previous play ratings in the previous formation are gone.   
  
Any ideas how to fix this?