If I add a layer from web (hosted on our ArcGIS server) that has a state plane spatial reference on top of a basemap that has a web mercator spatial reference (Esri or our own) I can enable popups on a layer and it works fine when I click on the feature in the map. If I switch the basemap to something that also has state plane, the popups do not work; just says "no information available." Does the basemap have to be Web Mercator to allow popups to work?