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The error appears universal for Chrome, Firefox, Safari, etc. I have repaired permissions, cleaned any caches I could find and so forth but the problem remains.

The problem appears also with externally loaded jQuery (for instance), returning in the case of jQuery the following errors:

$ is not defined (Firefox)

or

Uncaught ReferenceError: $ is not defined (Chrome)

Examples for websites that fail to load/run JS: reddit, omegle, www.translation-telephone.com.

What are some things I should try?

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Check the source code to see where the sites load their jQuery from, then ping these hosts or use curl to retrieve the jQuery files in Terminal. If it fails, you should get a useful error message. Have you checked web developer extension (Firefox) or Safari's Develop menu for resource tracking functionality that could also provide some information? –  Daniel Beck Jul 9 '11 at 8:16
    
Reddit uses ajax.googleapis.com to load the jQuery js. –  ZippyV Jul 9 '11 at 10:13
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