It appears that a previous administrator has changed or deleted the web site administrator profile
(name and password) when he quit the organization (a day or two ago).
I believe that it should be possible to restore this from a previous backup of the database.
While I could probably work out which database item(s) (corresponding to the administrator profile)
has/have been changed or deleted, by comparing before and after copies of the database,
I’d appreciate any tips that would save me this time and effort. Off-list response preferred.
Update : Have just looked at the database, and it appears to be trivially simple to fix.
Update : It was trivial to fix. Feel free to delete this.