I made the mistake of updating the Olisto app to version 2.32.1 (May 19 2022) on the Android 7 phone where I normally run it.
The update installed, it showed a startup screen when I ran it, and then a blank white screen. It didn’t get any further.
2nd try: Uninstalled it, re-installed it. This time it showed me introductory screens and prompted me to create an account or log in to my existing account. I clicked on Log In. Result: blank white screen again.
I uninstalled it again, restored backup version 2.25.6 of the app, and that version works fine.
The new version works on Android 11, just not on Android 7.