Upgraded my iPhone 5S to iOS9 tonight. Ran into the following problem: When launching certain apps a black screen is displayed very briefly before the app actually starts. Seems to only affect certain 3rd party apps (such as Twitter, Foursquare, Timehop) and not built in apps. Anyone else ran into this problem? Deleting the app and re-installing it fixes the problem. But quite a hassle to do that for every app that has this issue.