Use your browser development tools (Developer in Chrome or Firebug in Firefox) and look at the response of the packets from the AJAX calls. 200 isn't an error (actually it means everything went fine between the browser and server). The problem is most likely in jQuery processing the returned JSON. My guess is something is pumping out some extra characters in your AJAX calls.

FYI - the JSON string can be hard to make out in the browser, especially in the net panel. You can copy it and paste it into the site below to get it formatted, plus it will check it for any errors.

http://jsonlint.com/
Jamie Holly
http://hollyit.net
On 2/13/2014 6:49 PM, Steve Kessler wrote:
I hope someone will be able to help me. I have a site that gets a 200 error message for an AJAX error every time I use something with AJAX. This is everything from auto-complete fields to the entire views interface.  

The same site works perfectly on another server and the only difference between the two sites is the database connection string.  

I know that there is a difference in the configuration between the two systems such as the version of PHP but I am hoping there is something short of downgrading PHP to resolve this issue.  

I have found similar problems in the issue queue but none of those solutions appear to work.

Any help is greatly appreciated.   

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Steve Kessler
Owner and Lead Consultant 
Denver DataMan, LLC 
303-587-4428