Same issue, same frustration, same loss of productivity. No email regarding V10 being disabled. Nitro happily took our money in February, though, so good for them.
support case is 00109918. In addition to fixing this ASAP I'd love a note for my management to explain why our invoices are delayed this month. Half our firm uses acrobat, the other half Nitro. My guess is acrobat will be seeing more subscriptions from us soon