jQuery form plugins with file upload failed in Linux Google Chrome

jQuery form plugins with file upload failed in Linux Google Chrome

I'm using Google Chrome 4.0.288.1 unstable in Ubuntu 9.10.

I try the example in http://malsup.com/jquery/form/#file-upload, using JSON type. After I select a file and click the submit button, the browser display the <textarea> with the JSON value in it.

Anyone have the same problems? Is this a bug in plugins, or in Google Chrome?

Thanks