Mike, I am having the same issue. I am using ArcGIS ArcMAP v10 and I cannot add any of the maps I have created using ArcGIS Explorer Online. These maps show up on ArcGIS Online and I can manipulate them there but when I open ArcMap and log into ArcGIS and go to add data from ArcGIS online my groups show up but all I can see is the details, there is no option to see the maps. Also under My Data there is nothing. Any ideas? Thanks.
Eric