hope this answer helps some poor lost souls.
jquery must load before the acf stuff. for us, the problem was having async set on the script tag in an add_filter function:
<script type='text/javascript' async src='//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js'></script>
note that this is output by in in <head> by <?php wp_head(); ?>
we wrapped it with an is_admin() check thusly:
if(!is_admin()) {
add_filter( 'script_loader_tag', function ( $tag, $handle ) {
return str_replace( ' src', ' async src', $tag );
}, 10, 2 );
}
