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How can I get a troublesome iOS app back to normal?
Quitting and relaunching the app will cure many problems. Double-click the Home button, then touch and hold an icon until they all start jiggling. Tap the red circle on the app you want to quit, then double-click the Home button to return to the Home screen and relaunch it.
If symptoms persist, you may need to delete and reinstall the app. First, sync your device to back up its data. To delete the app, touch and hold an icon on your Home screen, then tap the black circle on the app you want to remove. To reinstall it from your Mac with iTunes, select your device in the iTunes sidebar, then click the Apps button at the top of the window. Check the app you want to install, then click Sync. To reinstall on the go with iCloud (to your GSM iPhone 4, iPhone 3GS, third- or fourth-gen iPod touch, or any iPad), launch the App Store and navigate to Updates > Purchased to re-download the app for free
Quitting and relaunching the app will cure many problems. Double-click the Home button, then touch and hold an icon until they all start jiggling. Tap the red circle on the app you want to quit, then double-click the Home button to return to the Home screen and relaunch it.