Just received this from Foreflight
Dear Customer:
Yesterday we released ForeFlight Mobile version 6.2 which includes support for our new Sync capability. Some customers are experiencing an app close (the app shuts down immediately after launch) after updating to 6.2. Within minutes of the issue being identified, we created a fix and immediately submitted that fix to Apple. Version 6.2.1 is currently under review by Apple and we expect the update to be released today.
If you have not yet updated to 6.2, we recommend that you wait until 6.2.1 becomes available.
For those of you that have already downloaded version 6.2, are experiencing the issue, and need to access ForeFlight immediately, the workaround is to delete and reinstall the app:
1. On the iPad/iPhone home screen, tap-and-hold the ForeFlight icon until it starts to wiggle
2. Tap the X in the top-left corner to delete
3. Open up the App Store and search for "ForeFlight"
4. Tap on "ForeFlight Mobile" and redownload the app
A delete/reinstall of the app will require you to re-download your charts and data, as well as re-enter your aircraft profile, user waypoints, and favorites settings.
A follow-up communication will be sent out once version 6.2.1 is available on the App Store.
Sincerely,
-Team ForeFlight