I have a problem with my WAB DE 2.5 applications in that when I switch to a WebTiledLayer basemap in the Basemap Gallery widget, all the needed tiles are not loaded initially. When I zoom in/out or pan from the initial extent/zoom level, the tiles are loading just fine. I figure the problem is on the JS API side because the Basemap Gallery widget is just a wrapper for the esri/dijit/BasemapGallery. How can I fix this problem? I'm using JS API 3.21. There are no such problems with ArcGIS Server Map services.
Thanks in advance,