Thanks Rob... disabline the elusive Frodo setting, as you said, restored the URLs in NFO files.
I accidently made a configuration change and now my xml commands within the nfo files do not include any artwork (fanart and poster) commands. The artwork is downloaded from the internet fine, and saved in the movie directory, but the url is not saved in the nfo file. Actors are fine. So the general question is: what needs to be enabled to get artwork information saved in the nfo file. And in general, how do I reset MC to installation defaults?