Have you looked at your profile and checked that your permissions haven't been changed by the update?
Tap on 'Panda's Nook'>Edit Profiles>Edit Panda>Manage Content>Books to check you can get access to the books and Apps to check you can get access to the Apps you want (I use this to take away access for Google Apps I don't want on my device, too).
The updates in the past have messed with permissions, so this might be what has happened to you.
Let us know how you get on.
It's been a week of Hell. First, a pin on my Nook charging cable bent (my cat might have chewe . . . )
That, plus dealing with the loss of every app to an upgrade just added to misery.
Your suggestion was so simple, I thought it would never work.
Voila, it did!