I have the exact same issue after my update...bottomline is that they want you to switch to a subscription program. For my situation, at least the bank account that is in the accounts list with the lightning bolt as you describe still exists in the bank register. I reconnected the one account and made it a subaccount of the problem account so that the data shows up in the register, even though the register and balance for the newly created account does not jive so i just ignore it for now. today is the day i may give in and buy the new program because this is a monumental waste of time. As poor as QB is and all the work arounds we users have to do, the other programs appear to be even less user friendly