My pre-ordered iBooks have suddenly disappeared from 'Store - Purchased'.
Any suggestions on how to retrieve them?
Check if you are signed in to the iTunes Store account you used to purchased the books.
Look for hidden purchases:
Hope this helps!
But I'm running iOS 6 on an iPad 4 so apparently I can't hide purchases. Also, the pre-orders were there, amongst the Purchases until a day ago.
Retrieving data ...