Release 66.23 / Build 27.1.66.23
I woke up this morning to find that the overnight scheduled download had not appeared to have run, but instead discovered that there were no institutions available for download because my Password Vault had been erased (contained no entries at all). The vault wasn't deleted because the master vault password still worked fine. When I examined the account records they appeared to have been disconnected from all institutions (Chase and 1st Security).
The FIX seems to be to treat each of the accounts as if they had never been set up and create all the online information for each of them individually. Once that was done, all transactions were downloaded and the password vault once again appears as expected.
Why would the password vault get completely emptied (not deleted) and all online institutions be disconnected overnight?