Just checked it on Yosemite 10.10.5 and it looks fine.
2 possible solutions:
1. In iReal Pro, go to Preferences and Reset All Settings.
2. Could you check your MacBook's settings? Click on the Apple on the top left, then About this Mac/System Report/Software/Accessibility.
Email us directly please.

Yes, if you make a backup, you can simply drag and drop it over the iReal Pro icon in your Dock to import them.