No update buttons in App Store iOS 9
I can't update any of my apps in the App Store on my iPhone 6. I just upgraded to iOS 9. Immediately after the upgrade, I there were about 76 apps that needed updating. I chose a few to update, and those installed fine. But now when I go to the Updates area, every single app has an OPEN button next to it instead of an UPDATE button. Sometimes when I go to the Updates area, each app will briefly have an UDPATE button, but each one very quickly changes to an OPEN button. The Update All link at the top is disabled.
iPhone 6, iOS 9