As far as I can see the problem is the new DE. It saves the key differently in the registry so the key retrieval script doesn't get it right (and as a follow up the decryption scripts won't get it right either).
A quickfix is to register with an older DE, then get the key and Adobe will force to update to a newer version. If Adobe forces you to upgrade right away you've got a problem.
So if you have already registered you should be fine but for a new registration it could fail.
If my suspicions are right it should get problems with epubs as well ...
Can somebody else verify that by installation the newest DE, reregister, download an e-book and try to decrypt?
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