I am restarting this issue. None of the fixes that I have tried as suggested in previous threads have worked. When I start ArcGIS Explorer 1500, no stock base maps are drawn, and I get the error message: The basemap contains one or more invalid layers. No matter which base map I choose, I get the same error. I can add World Country Boundaries from ArcGIS Online. I can get directions from point to point (e.g., Philadelphia to San Diego) - the route is drawn and directions provided, but background is white (no basemap). I have uninstalled and reinstalled at least 4 times with same result. I have deleted all caches: on restart, still no stock basemaps.
If I Test Connection Speed, I get:
Download Speed: Good 192 kilobits per second
Network Latency: Excellent 0 ms
Proxy Server: Passed No proxy server
Network Route: Failed Test Site Unreachable
I am using Windows 7 home.
Any suggestions? Thanks