I've put off updating the app given Sharky's experiences with the increase costs of unlocking things after updating.

Last night I found that my characters had been used in an event, something that often gives you a free crystal or two.

Somehow though I had earnt 1750 million crystals!

With that many free crystals I was able to fully upgrade all my characters to their max levels and unlock areas without enough coins. It basically unlocked the rest of the game for me.

And then this morning I open it up and the game has been reset to the beginning. All progress, areas opened, characters unlocked and levelled up -- all gone!

I have no interest in doing all that again, unless they give me enough crystals to get me back to where I was before the glitch.

I've deleted the app.