I have had google maps working on my websites (different hosts also) or several years. Today for some reason they stopped working.
I was/am using this page as a basis: https://developers.google.com/maps/documentation/javascript/examples/layer-kml
The problem is when I copy that HTML and upload to my server as is, it works fine. But when I download and then upload to my server the KML file (https://googlearchive.github.io/js-v2-samples/ggeoxml/cta.kml) and change the html to reflect it, it doesn't work.
I have tried it on 2 different servers.
Update:
http://www.feztravel.com/testMap1.asp
A direct copy of the example mentioned above, it works
http://www.feztravel.com/testMap2.asp Only difference here is the cta.kml file which is on my hosts server.
Again both servers that I have access to were working 2 days ago.