Unfortunately, the iOS update to version 8.3 has not only brought improvements. Some things, such as the internal handling of the on-screen keyboards, was very much changed. Changes that lead to problems for many apps.
To operate Textkraft on iOS 8.3 without problems you need at least the following versions of the app. The updates are shipping since the early morning hours of April 10, 2015. Follow the links below to see, if your app update is already available and download it right away.