Immediately quit and reload the game. Hope that it hasn't saved the update for those tiles yet. This has worked for me a few times and failed MANY times.
Typically you can't fix it if you merge over max level, the tiles get deleted and the sprite gets stuck on the screen.
I've been experiencing issues with the app for quite a while now. Since this winter, it crashes immediately after loading and is completely unusable. The original app, however, works just fine.
Does anyone have any advice or solutions for those of us dealing with this problem?