The server shouldn’t effect it.
You posted this
$field = 'editor'; // 'editor' being the field name for a wysiwyg editor
$fkey = get_sub_field_object($field); // retrieve the key for the editor
acf_form(array( 'fields' => array($fkey['key']) )); // hopefully display editor & contents
This makes me believe that you looping through the rows getting the value for $fkey and while still in that loop you’re calling acf_form(). I think you’re going to need to give me some more code to look at.
Just in case you’re unaware of this, if you put backticks around your code it will make make it look like the code I added above.
