Sometimes piano chord font doesn't show

[Robotor]

Seemingly at random, the piano chords on the sheet don't show. What causes that, and how do I fix?

IReal B Pro version 5.0.4
iOS version 7.1.1

[dflat]

Are the songs your own? you might have used custom chord qualities (not formed from the official ones the player understands—use the Quality menu or correctly use the keyboard to input the correct qualities).
Or are you playing back the exercises or the large playlist songs (Jazz 1300 etc.) which are all checked for playback and chord diagrams?
If you change to Guitar font, do the diagrams show? or do the scales?
You could post a song here that does not behave and someone can look at it.

[Robotor]

Are the songs your own? you might have used custom chord qualities (not formed from the official ones the player understands—use the Quality menu or correctly use the keyboard to input the correct qualities).
Or are you playing back the exercises or the large playlist songs (Jazz 1300 etc.) which are all checked for playback and chord diagrams?
If you change to Guitar font, do the diagrams show? or do the scales?
You could post a song here that does not behave and someone can look at it.

No, these are unedited songs from the Jazz 1200.
I don't own the guitar or scales font...

[dflat]

OK, thanks for this information.
Try force quitting iReal Pro from the multi-task dock, then launching it again and test.
If still faulty, turn off your device completely then restart, then check.

Other questions:
Is it the same bars each time or different ones?
Is it in different songs consistently or just certain songs?
Is it certain chord letters or any?

You could also run a backup (Settings>Backup), email to yourself, uninstall iReal Pro, then download it again from the App store. You can test on the exercise songs in there then restore your backup and test again.