Solved! Go to Solution.
Here is an interesting one where I used the Bookmark for Apalachia and then panned. The selection outline is in the correct location, but the purple polygons did not catch up.
PJ
You can change the basemap choices when using the embedded map or Basic Viewer template but you'll have to append some url parameters to the url. To change the displayed basemaps you need to create an ArcGIS.com group that contains the basemaps you want to appear in the gallery. Once you've done this you can apply this information by adding the following parameters to your url. The basemapGroupOwner will be the owner of the new group you created and the basemapGroupTitle is the title.
https://team.maps.arcgis.com/apps/OnePane/basicviewer/index.html?appid=422dca2738b941cb8f5fd3f1b0109... &basemapGroupOwner=Kelly &basemapGroupTitle='Basic%20Viewer%20Basemaps'