It would appear that the token the javascript api is adding on is the problem, if the token is removed I can navigate and see the thumbnail.
Is there a way to remedy this?
Is the problem that the URL string is too long and it is being cut off therefor requesting a bad URL and the server returning a 403 Forbidden?
The code for the basemap Gallery is: var basemapGallery = new esri.dijit.BasemapGallery({ showArcGISBasemaps:true, map: map }, "basemapGallery"); basemapGallery.startup(); Very basic right from the sample!
It is not in AMD format, as the Timeslider template switches between legacy and AMD. My project timeline doesn't permit enough time for me to rewrite the legacy dojo.