I set up Firefox Sync on 4 devices - three Windows PC computers (standard user accounts on all three) and one Android smartphone. The initial syncs all went fine, but I ran into real problems when I also tried to sync Firefox in my administrative account on one of my PCs. This attempt failed, and now syncs aren't happening for any of my devices, even when I execute a "Sync Now," and the "Manage Account" button has disappeared from all of the Sync Options dialog boxes (the same box that is reached when the "Set Up Sync..." menu command is given) on all of my computers, no matter what I do, so I can't get to my Recovery Key. When I do "Set Up Sync..."/"I have an account"/"Sync Options", the Device Name is correct for all my computer's accounts, even the administrative account I tried to set up, and my Android phone keeps saying that my device is being synched on a regularly basis (although only with data already on the server, not with data from any of my other devices), so my Sync account shows some signs of life. I'm wondering how I get Sync working again?