Abbott have updated the website now with the fix. You have to delete the app and reinstall. Useful video from Abbott here. Although you will lose all of the data logs on the app, it is still available in the Libreview so your hospital and yourself can view the history online instead.
The app...
I have an iPhone 12 too and the Shuggah app seems to be working fine on mine. Took a few scans to link up to it at first but it is working well at the moment.
Definitely the app update. My was working fine and then not working after the update. Downloaded the Shuggah App instead which seems to be working fine for now.
Had the exact same issue this morning. Worked fine first thing but straight after updating the app a blank screen. I have however downloaded the Shuggah app which seems to be working fine with the sensor for now until Abbot get their own app sorted. Will be using the Shuggah app and finger...
It is the updated app that is causing the issue unfortunately. If anyone hasn't updated it yet I wouldn't as mine was working fine this morning. As soon as I updated it blank screen and crashing