[Shinichi_bien]

Can you tell me where exactly you added this filter?

in vbbridge.php

just before

PHP Code:

add_action('publish_post', 'Vbridge_Post'); 


but you can add anywhere that you want, I put it there to keep it close to the add_action (easy to remember)

please change the posted code to the following, add this filter only in admin end

PHP Code:


if (is_admin()) {
add_filter('wp_dropdown_users', 'vb_post_author');
function vb_post_author($output) {
    global $post;

    $vb_post_author = get_userdata($post->post_author);
    $output = str_replace('</select>','<option value="'.$post->post_author.'" selected>'.$vb_post_author->username.'</option></select>',$output);
    echo $output;
}
}