Uncaught Reference Error: stLight is not defined (in Chrome only)-Collection of common programming errors

My web page ends thus:

var switchTo5x=false;


stLight.options({publisher: "ur-24e62f76-1f66-e3aa-1190-c533b729ca11", doNotHash: true, doNotCopy: true, hashAddressBar: false});

  

In FireFox and Safari, it behaves. In Chrome:

Uncaught ReferenceError: stLight is not defined nectar-tugg-art:229
(anonymous function)

In other words, the code at w.sharethis.com/button/buttons.js has failed to execute, and hence, failed to define the stLight variable.

The page is part of a Django web application running on a remote server. Saving the generated HTML page locally, then viewing in Chrome, works correctly.

At this point I’m stuck. Something to do with the cross domain security model? There aren’t any security exceptions.

Some weird interaction with the other javascript files?

The static (generated) code is here. It won’t run from Dropbox though.