I’ve been having issues, only recently, where, when starting the Monzo app, it’s using Face ID to log me in but then comes up with a black screen with the Monzo logo in the middle. And that’s it.
Sometimes prodding the screen causes the usual app screen to appear but sometimes it doesn’t - I have to close the app down and try again. Sometimes a few times.
I’m running v2.25.0 of the app on iOS 12.1 on an iPhone Xs.