IssueTracker

Have you looked at using the Asynchronous Loading method https://developers.google.com/maps/documentation/javascript/tutorial#Loading_the_Maps_API ?

Example 1. Just trying to attach your gmaps script.
If you open the developer console, you will see that gmaps init script is loaded, but "getScript("https://maps.gstatic.com/intl/en_us/mapfiles/api-3/9/8/main.js");" line isn't working, there is no new script in the document after document.write.