iRealPro won't play on late 2013 iMac

[propower]

OSX 10.8.5
imac 2013 i7 3.5 16G ram, 256ssd
Have ProTools HD Native Thunderbolt installed
Monitor using Dangerous Source via USB - no additional driver

iRealPro loads and i downloaded 1300 jazz tunes. Works fine on my ipad2
When I go to play a song on my imac I get a brief flash where the countoff usually happens and then it just stops.
That's it - never makes a sound.

PS - I deleted the app and reinstalled but same thing. Also i deleted all the songs and now when I reinstall I get - no songs.
- How can I do a full uninstall and start again?

I also tried using just the internal imac speakers as the output device - same thing.

 

[Niki]

It's an issue with Apple's sandboxing system when you use an audio interface.
Please email us the receipt of your Mac App Store purchase of iReal Pro to support at irealpro.com and we will send you a code to a different version of the app.
Thank you!

 

[propower]

It's an issue with Apple's sandboxing system when you use an audio interface.
Please email us the receipt of your Mac App Store purchase of iReal Pro to support at irealpro.com and we will send you a code to a different version of the app.
Thank you!

Cool. Will send it once I get it.

 

[cactusgary]

No problems on my Mac Mini OS X 10.9.2 i7 2.3 16 G ram works perfectly - except for the issue of the overlap display on some chords