I posted a while back about a serious issue we were having with the Medallion App. I got a very quick response from a Princess contractor that eventually solved (so far) the problem. I was very happy with the attention Princess gave to the problem. It apparently required some trouble shooting and tweek to the program to repair. Initially we still had the problem on my wife's iPhone. The contractor asked us to perform the following on her iPhone and iPad.
"... log out of app on any device you are using, reboot your device and log back in to the app, this should remove any phantom cache, which could be the culprit. Should it continue the next step would be go to settings and for Android [optimize device] go through the steps to do so. For Apple go to general, then iPhone storage, then app and off load app, then reinstate app. The next step would be to delete the app entirely and reinstall fresh from the app store."
To solve the problem we needed to go to the second step. The key was to 'off load' (an option that appears) the app. After following these steps the app worked just fine. My computer experience is limited to hand crank Monroe calculators (for the less mature Google it). But I assume there is a cache associated with the app that needs to be deleted and 'off loading' the app accomplishes this.