I have added some new maps to ArcGIS Online. They show up in the Collector apps directory, but when I click to load them I get: "Unable to load the map. Please try again." My older maps still show up and load into Collector properly. My latest maps use the same setup as a previous one. When I examine the layer properties and JSON settings, the settings look identical (only layer name and extent settings vary). I am using the Android version of Collector. I've tried reinstalling Collector. Any suggestions?