I'm really hoping this is simply related to the conversion this weekend and will go away quickly ... in the past couple days, I've noticed on the iOS app :

• flights involving L-US planes hangs when trying to load
• any itinerary that's not nonstop, even if they're partner award tickets, hang when trying to load

For my upcoming flights on 11/7 and 11/8, I'm definitely printing out paper copies of my itinerary in case any lingering system conversion issues aren't resolved by then .....