Let me set up the scenario:
I add a Feature Layer from web to my ArcGIS Online Web Map.
I change the symbology for the Feature Layer within my web map.
I save the web map. Everything looks great.
My boss tells me that she wants to see a different base map upon opening my saved web map.
I re-open my saved web-map, change the default base map say from Bing to Topo.
I save my web map.
When I re-open this web-map whether in ArcGIS online or through ESRI ArcGIS app - the symbology that I originally set and saved in ArcGIS online web map returns back to default symbology.
I can go back to my ArcGIS online web map and symbolize again and save, and the symbology will be back to normal.
It goes back to default, however, if I open my web map and click 'save' again.
Any thoughts on this?
Also, it seems to only return feature layer symbology back to default - I have shapefiles from my local drive in the map that are symbolozed and their symbology stays as is.