This is a problem I do not have myself, but have discovered on the accounts and devices belonging to a couple bandmates. I only had time for a quick check during our practise-session, but couldn't see anything obvious cause.
One person has a problem changing colour and position of embedded chords. Change, save, back to the menu, then reopen prefs and it looks as if nothing happened. I would understand an error such as for example "permission denied", but the app show no sign of anything wrong. This problems has since been filed as ticket #22335 This problem was with an older smartphone running Android 6.0
Yesterday our keyboard-player was unable to make changes to personal transpose stick. No error message or other problem indicated by the app in this case either. I was able to edit and save other information about songs from the same account/tablet.