'Prob'ly a combination of tech problems ,- yes, I know, you would think they would have a moderately firm grasp of that sort of thing, wouldn't you
but this side seems to be a weak spot for some reason - and various geographical ,and author's / publisher's, agreements, copyright etc...
You would think it would be relatively simple to start another online bookshop, especially with all the examples there are out there, and having one already running elsewhere.
I don't remember any huge publicity about Sony suffering any more than any other firm over the tsunami, either.
Perhaps it might simply be a result of trying to cope with launching a completely new device, then the Pottermore quagmire, on top of simple things like opening a store !
Too many chickens in the kitchen causing the soup to overflow onto the cook/s........ ? 