We have been seeing some people with various issue after updating the game or after installing DLC.
This can easily be fixed by restoring your purchases.
If this doesn't help:
Usually, a restart of your device will solve this issue.
If not, make sure you have in-app purchases turned on.
These Steps work for everyone that has contacted me about this issue:
1. Restore purchases.
2. Hard restart your device.
4. Sign out of the AppStore and restart your device and sign back in.
A few people have mentioned the following:
3. Update your iOS version.
If you have tried the following steps and the issues still exist, I recommend pursuing a refund from the Appstore.
I hope this helps.