Terrabus

Thanks Peter. For now I’ve commented out the WordPress hooks in the __construct function to stop the automagic extraction. Instead, the extraction is done in the ‘wp_insert_post’ hook in functions.php:

function extract_image_metadata($post_id) {
    global $image_metadata_cruncher;

    // Only extract when post type 'photo' is saved
    if (get_post_type($post_id) == 'photo') {
        $featured_id = get_post_thumbnail_id($post_id);
        if ($featured_id !== '') $image_metadata_cruncher->crunch($featured_id);
    }
}
add_action( 'wp_insert_post', 'extract_image_metadata', 10, 2);

The above solves my problem. Again, I love the plugin. Hope this helps someone.