Pokemon Go iOS Update Causing Trainer Club Login Issues

Users are reporting that the iOS update is actually preventing some Trainer Club members from playing.
Trainers may want to hold off updating for now.

Pokémon Go: How to fix “we're not detecting your phone's orientation” and other bugs

Pokemon Go trainer has been playing so much it burnt their iPhone screen - Dexerto

Pokemon Go Can't Log in with Facebook: How to Fix It?

Pokemon GO DOWN: Niantic Servers Login not working for Pokemon Trainer Club (PTC) users - Daily Star

Pokemon Go Can't Log in with Facebook: How to Fix It?

Pokemon Go' Failed to Log In Error: What To Do

Pokemon Go for iOS receives update to version 1.0.1; fixes privacy issue, improves stability, more - PhoneArena

Guide: How to Fix Pokémon Go Black Screen [iOS/Android]- Dr.Fone

Top 5 Methods to Fix Pokémon GO AR Not Working

Unable to Play Pokémon Unite Due to Deleted Pokémon Trainer Club Account — Pokémon Forums