Although we mostly receive positive feedback on our new 4.2.1 update for iOS, there are some of you having problems during the update.
If this was the case, please try the following:
Deinstall the app from your device (click on the app icon a little longer than usual, until it starts to wobble, then tip on the cross in the upper left corner and confirm that you want to delete the app).
Go to the App Store and download the app again. You won’t be charged again. Now the problems should be solved. You can restore your already purchased upgrades by clicking on “Redownload” in the App’s “Upgrades” section.