Does anyone know why a few of the basemaps will work when brought into Google Earth Pro and others will not? For example when I go to http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_Imagery_World_2D/MapServer and click on view in Google Earth, it shows up fine in Google. But, http://server.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer does not. My only guess would be the spatial reference...? I tried saving the kmz to a local drive and generating a kmz file to no avail.