Hi @glennyboy
The line Uncaught ReferenceError: acf is not defined
will occur if any JS error occurs before ACF is instantiated.
Any JS error starts a snowball effect where all following JS gets the blame.
Your origional error talks about event.returnValue
and body.scrollLeft
.
Perhaps these errors are comming from another plugin / theme code. Feel free to seach the ACF input.js file, but I don’t believe these errors are coming from ACF.
Thanks
E