I'm using Strava for a long time without any issues. 
Yesterday was the first time where I added two people to a run. Everything worked fine. Afterwards one of those persons deleted this activity from theirs. 

Now I have the problem, that my app doesn't work anymore. The home tab tries to load activities but stays white. When I reinstall the app and login at least the activities show for some time, but when I want to try to record a new activity, the map is black. Also if I open the map of an existing activity it is black. When I close the app and open again I'm back to the beginning -> No activities load, the screen stays white. I already deleted the activity which I suspected caused this behavior.

Device: Google Pixel 8 Pro with latest software updates.