Looking for help getting return values

I'm using a jquery plugin to do a hidden iframe upload. The script is functioning properly up to the 'submit' portion because the process.cfm file is doing everything it should. The trouble is, I can't get the process.cfm to return data to the script.

Has anybody worked with Valums' AjaxUpload plugin with ColdFusion and had success? Is there a server setting in my testing environment I need to be aware of that might be fouling up the works?

For some reason the script never gets the return data to indicate that the work is done and consequently never moves on to the 'onComplete' function.

Thank you for any assistance.