bulk add categories

this works fine in 2.9, but not in 3.0 and 3.0.1

when creating categories with children, it doesnt show up in the manage category section, but if you goto make a post it shows up fine, when you goto categories, you have to edit the parent, and click update, then they show up in the category list.

here is a trac entry from months ago, see it wasnt resolved.

http://core.trac.wordpress.org/ticket/14471

the format is as follows

Finance/Mutual Funds
Finance/Personal Finance
Finance/Real Estate

here is the code

<?php

add_action('admin_menu', 'bulk_cat_menu');

function bulk_cat_menu() {
    add_management_page('Category Import', 'Category Import', 10, __FILE__, 'bulk_add_cat');
}

function bulk_add_cat() {
    global $wpdb;
    $cats = $_POST['bulk_category_list'];
    $s = split("\n", $cats);
    foreach($s as $cat){
        $cat = trim(preg_replace("![\r\n]+!", '', $cat));
        $cats = split('\/', $cat);
        $last_id = 0;
        foreach($cats as $c2){
            $last_id = wp_create_category($c2, $last_id);
        }
    }
?>

<div class="wrap nosubsub">
    <div class="icon32" id="icon-edit"><br/></div>
    <h2>Bulk Category Import</h2>
    <form name="bulk_categories" action="<?php echo htmlspecialchars($_SERVER['REQUEST_URI']) ?>" method="post">
        <br/>
        <strong>Enter a list of category names, one per line:</strong>
        <br/>
        <textarea name="bulk_category_list" rows="20" style="width: 99%;"></textarea>
        <br/>
        <p class="submit"><input type="submit" name="submit" value="Add categories"/></p>
    </form>
</div>
<?php
}
?>