[Steven Zahm]

@ Justin

Can you disable WP_DEBUG? After you do this, are there any other javascript errors shown in the browser console?

If you can supply me, as a private reply, the CSV file, a WP admin account and the field mapping, I’ll take a look.

At this point I believe there is another plugin or theme causing either a fatal javascript error or causing a PHP error/notice to be output which is correcting the expected json reply.