ShareThis script GET fails for one known computer

Question

Issue is a failure to load ShareThis script.

This has been tested without issue on 8 different computers. The one where the issue occurs is (of course) the client's laptop. Running Windows 8 the issue occurs in both Chrome and FireFox.

Script is initialized in javascript file like so:

$.getScript("http://w.sharethis.com/button/buttons.js", function() {
        var switchTo5x = false;
        stLight.options({publisher: "my-uid-here", doNotHash: false, doNotCopy: false, hashAddressBar: false, shorten:false });
    });

On client's machine we see

and

Interestingly there is no request method or status code in client's headers for only this one file. Others have method and and 200 or 304 code.

Sorry - client's screenshots are huge.

So my question is what conditions on a single computer could be blocking ShareThis? I have not see AdBlock or similar have issues with it before...