"Unable to load source file"

I am trying to load an FME Workspace that generates KML into Bing. I used to be able to do it, but now every time I try, I get the error, "Unable to load source file."  Strangely enough, when I put the URL into a browser, I get a KML returned. But, when I try the same exact URL in javascript for Bing maps integration, I get the "Unable to load source file" error each time.

 

 

Already tried and did not work:

 

1) Specifying ports in the URL (:80) to no avail.

 

2) I can load KML into Bing maps from an FME url ("http://fmeserver.com/fmedatastreaming/Demos/REST-kmlstreaming.fmw") but not from the server that FME is loaded on within my corporate intranet

 

3) I have tried running the web page on IIS directly (port 80) instead of using the WebMatrix IIS express (which uses port 7313) to host the pages; still get same error.

 

4) I have tried granting full permissions to the fmeguest and fmeuser roles, still get the same error.

 

 

Know that:

 

- The computer I am running IIS on is on the same corporate intranet domain as the server that is hosting FME Server.