I just downloaded the Mac OS X version to try it out and upon clicking 'Demo Mode' I am presenting with the next screen which is mostly blank (Screenshot: http://i.imgur.com/evyyF5v.png).
That's a bummer. Sadly, I don't have any guesses as to why. I'm happy to help debug if you want: nick@realartists.com, but understand if you don't want to spend any more time on it.