After upgrading to jQuery 1.4.1 from jQuery 1.3.2, my getJSON requests fail.

The error given to the ajax error handler, is "Invalid JSON: ..." where "..." is the text of the response.

Firebug parses the JSON fine, and can display the JSON data as such in its console, and jQuery didn't have an issue with the same data with version 1.3.2.

I don't understand why this is happening. does anyone have any ideas?