Usually, I would recommend an application cache clear, but I don't believe there are any Apple devices that allow this at this time without doing a full uninstall and re-install of the application. So, honestly, I would say to give that a try. Uninstall the application, reset the phone, and then install it again. You won't have to purchase the application again so long as you haven't changed the noted Apple ID on your phone since you purchased the application.
Let us know if this resolved the issue; thanks!!