We believe we have located the issue:
line 107 acf-font-awesome.php
add_action( ‘after_setup_theme’, array( new acf_plugin_font_awesome, ‘init’ ), 0 );
changed to
add_action( ‘plugins_loaded’, array( new acf_plugin_font_awesome, ‘init’ ), 0 );
Changing the action hook from “after_setup_theme” to “plugins_loaded” resolved all of our issues… although we haven’t tested extensively
this hook resolved my issue too …