I'm not sure if you have tried this, but try deleting the app (including deleting it from General > Storage & iCloud Usgae > Storage - if it is listed here as well), rebooting your iPad and then installing it again from the app store
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I'm not sure if you have tried this, but try deleting the app (including deleting it from General > Storage & iCloud Usgae > Storage - if it is listed here as well), rebooting your iPad and then installing it again from the app store