my wife is an aurhorized user on my account and has been ordering ebooks on her 7th generation Kindle. Everything worked fine until recently. The default is set to her Kindle, but books no longer download when she orders them. Even if she goes to Manage Devices and selects Deliver, they still don’t download. If I go to Manage Devices under my name, and select Deliver, they do download to her Kindle. Whassup?