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Try these tips they might help to resolve the problem:Delete any apps that you do not need. (Not having a lot of memory on your device can cause freezing/loading problems)
Check in the Appstore that you have the latest version of the game installed
If you play while connected to Facebook, try logging out and then back in again.
Restart the iPad
Hopefully this resolves your problem.
My friend had the same problem and she said that she simply uninstalled the app and then completely re-installed it again. Be careful though, you need to have the progress saved with Facebook or you could lose all of your levels But that should work to resolve the problem!