Problems creating threads with build_new_post in VB3

[confus]

my searches for similar threads only found ones for 3.5 so hopefully someone can help me

I've written a threadbot that makes a new thread from stored data in a table, as far as I can determine the information sent to build_new_post is correct and should make a thread without a problem, and when running it manually there isn't a problem

However when using Scheduled Task Manager the thread is posted as the nick of someone currently browsing the forum (its ignoring whatever I setup in my script)

I vaugly guess I know what is happening (build_new_post is grabbing the posting username from whoever is online) but I can't seem to solve the problem

any suggestions?


here is the relevent code in my script:

PHP Code:

    $foruminfo = fetch_foruminfo($tbt_forumid);
    $bbuserinfo = fetch_userinfo($tbp_userid);

    $post['parseurl'] = 1;
    $post['signature'] = 1;
    $post['preview'] = 0;
    $post['disablesmilies'] = 0;
    $post['enablesmilies'] = 1;
    $post['rating'] = 0;
    $post['iconid'] = 0;
    $post['message'] = $tbp_pagetext;
    $post['title'] = $tbt_title;
    $post['emailupdate'] = 9999;
    $post['folderid'] = 0;
    $post['username'] = "confus";
    $post['poststarttime'] = TIMENOW;
                            
    $post['posthash'] = md5($post['poststarttime'] . $bbuserinfo['userid'] . $bbuserinfo['salt']);

    build_new_post('thread', $foruminfo, array(), 0, $post, $errors);