WordPress MU

I have an external script I am writing that needs access to users' posts databases. I have the entire script working with one issue:

Every tip I find says to include the 'wp-blog-header.php' file for access to the worpdress API's. This does work, except for when the WPMU install is configured with the blogs at the end of the url, as in domain.com/blogname/ because when I include the header file my script gets redirected to a registration up page.

So my question is, when the blog is set up to run as domain.com/blogname/ how can I include the necessary files to access the WPMU API's, namely the $wpdb object, without the app redirecting me to a new blog registration page?

Have you tried wp-load.php instead? Not sure why it's redirecting.. it's not supposed to. It goes to wp-signup.php right?

I think this is a bug in wpmu_settings.php (lin 115 approx)

$current_blog = $wpdb->get_row( $wpdb->prepare("SELECT *
FROM $wpdb->blogs WHERE domain = %s",$domain) );

fails, as $domain does not have correct info (at least in my install)

if( constant( 'VHOST' ) == 'yes' ) {
        $current_blog = wp_cache_get( 'current_blog_' . $domain,
'site-options' );
        if( !$current_blog ) {
                $current_blog = $wpdb->get_row( $wpdb->prepare("SELECT *
FROM $wpdb->blogs WHERE domain = %s", $domain) );
                if( !$current_blog ) //add this line and the following
                  $current_blog = $wpdb->get_row( wpdb->prepare("SELECT
* FROM $wpdb->blogs WHERE domain = %s", $current_site->domain) ); //until here
                if( $current_blog )
                        wp_cache_set( 'current_blog_' . $domain,
$current_blog, 'site-options' );
        }

$domain is unsuccessfully guessed at the beginning of the script. I use $current_site instead to retrieve $current_blog.