gettingthere wrote:It's working for me today on the same Chromebox that I was having an issue with a couple of days ago. I didn't implement the workaround so maybe something was fixed?

Nope. Still not working.

I'm having this issue on both Firefox and Chrome.

This looks like it's being caused by a failed security certificate. If you go to the requested virtualearth url manually and accept the certificate (which isn't recommended just in case something nefarious has happened) then the map editor works. This is something that virtualearth need to fix on their end.