Tablet - iPad Mini
Version - 9.2.1
I think this one is somewhat related to why the coins start at 0 despite having 1000+ on the desktop version with the same account. It would appear that your game count is reset on the app, thus you can't play Ranked until you've won 50 games on the app (Which is pretty troublesome, considering how long it takes to start even a single game). I can still play Ranked on desktop, but not the app.
Desktop screenshot - https://www.dropbox.com/s/snul19jsbytyglu/Screenshot%202016-04-02%20at%208.31.42%20PM.png?dl=0
Mobile screenshot - https://www.dropbox.com/s/pv32yn4et3m6m6l/exa1.PNG?dl=0