Unable to switch back to Esri Basemaps from a custom (third-party Web Map Service (WMS)) basemap in a web mapping application, or Web AppBuilder in Portal for ArcGIS 10.3.
Last Published: February 12, 2016Portal for ArcGIS
Bug ID Number
February 9, 2015
February 15, 2023
Portal for ArcGIS
Operating System Version
After review by the development team, it has been determined that this issue is related to a known limitation with the software that lies outside of Esri's control. The issue's Additional Information section may contain further explanation.
Here is the reference for that widget, which indicates that all basemaps added to the gallery must have the same spatial reference: