Problem Resolved
The problem was with Adobe Extension Manager - possibly self-inflicted because I killed the Extension Manager Process after waiting for an hour for the DataBridge extension to un-install.
With the help of WebAssist Support and a chat with Adobe Support - it was decided that the best course of action was to un-install then re-install my Adobe Suite.
This I did and all is now well.
I'd like to thank Web assist for their prompt and professional support.