I see this question has been asked before. It never gets answered. I am running ArcGIS Online.
In the opening view of My Map (before I have loaded anything) I try to switch the basemap to USGS National Map and get the message that it is not available so I click on OK.
When I try to load one of my existing maps that uses the USGS National Map. I get the same note that it is unavailable and ArcGIS is switching to my default basemap. It doesn't. I am unable to edit the existing map.
When I share a map with the USGS National Map to the public users get a note requesting them to log in.
Is the something I can do to set the default basemap in ArcGIS ? Can't ArcGIS simply switch to another publicly available basemap?
Running Win 7 (and 8.1) in IE 11 and Chrome.