When changing Page Template to one that consist s of ACF PRO fields, they don’t appear until the page is published.
There wasn’t such bug in the older version of ACF PRO.
This is a known bug and it will be corrected in the next version. There is a PHP warning that is causing the problem with the AJAX request. If you turn off the display of PHP errors it should work for you.
Oh, that’s good to know. Waiting patiently for next version.