Magento product edit screen, categories not appearing

I have a magento store (ver 1.5.1.0) with a lot of categories, the categories have been added using the following category duplication script -

<?php
if(!is_numeric($_GET['id']))die('Please specify a category ID');

$catId = $_GET['id'];

$xml = simp开发者_运维技巧lexml_load_file('app/etc/local.xml');
$host = $xml->global->resources->default_setup->connection->host;
$username = $xml->global->resources->default_setup->connection->username;
$password = $xml->global->resources->default_setup->connection->password;
$dbname = $xml->global->resources->default_setup->connection->dbname; 
$res = mysql_pconnect($host, $username, $password);   
mysql_select_db($dbname);

$catsDone = 0;
duplicate_entity($catId);
echo $catsDone . ' Categories duplicated.';

function duplicate_entity($id, $parent_id = null){
    global $catsDone;


    // Grab category to copy
    $sql = "SELECT * FROM catalog_category_entity WHERE entity_id = " . $id;
    $query_entity = mysql_query($sql);

    $entity = mysql_fetch_object($query_entity);

    if(!$parent_id)$parent_id = $entity->parent_id;

    mysql_query("INSERT INTO catalog_category_entity (entity_type_id, attribute_set_id, parent_id, created_at, updated_at, path, position, level, children_count)
                        VALUES ({$entity->entity_type_id}, {$entity->attribute_set_id}, {$parent_id}, NOW(), NOW(), '', {$entity->position}, {$entity->level}, {$entity->children_count})");
    $newEntityId = mysql_insert_id();

    $query = mysql_query("SELECT path FROM catalog_category_entity WHERE entity_id = " . $parent_id);
    $parent = mysql_fetch_object($query);
    $path = $parent->path . '/' . $newEntityId;

    mysql_query("UPDATE catalog_category_entity SET path='". $path."' WHERE entity_id=". $newEntityId);

    foreach(array('datetime', 'decimal', 'int', 'text', 'varchar') as $dataType){
        $sql = "SELECT * FROM catalog_category_entity_".$dataType."
                WHERE entity_id=" . $entity->entity_id;
                //die($sql);
        $query = mysql_query($sql);
        while ($value = mysql_fetch_object($query)){
            mysql_query("INSERT INTO catalog_category_entity_".$dataType." (entity_type_id, attribute_id, store_id, entity_id, value)
                            VALUES ({$value->entity_type_id}, {$value->attribute_id}, {$value->store_id}, {$newEntityId}, '{$value->value}')");
        }
    }

    $sql = "SELECT entity_id FROM catalog_category_entity WHERE parent_id = " . $id;
    $query = mysql_query($sql);

    while ($entity = mysql_fetch_object($query)){
        duplicate_entity($entity->entity_id, $newEntityId);
    }
    $catsDone++;
}
?>

The categories appear fine in the category tree, front end, etc, however on the product edit screen on the category edit tab, I can only see the default category?

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Your "children_count" column in catalog_category_entity is probably incorrect. I had the same problem.

Run this:

UPDATE catalog_category_entity SET children_count = "1" WHERE children_count < 1;

Reference / more info: http://zaclee.net/magento/errors-magento/magento-product-edit-only-shows-default-category

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Your import script didn't cover all the table columns of "catalog_category_entity" table. Basically, you forgot to update "level" and "children_count" rows. Here's how you can fix this.

Oh, and I forgot. Zachary's script linked here is also bad. It does not fix the problem, but merely mask it and leave it to JavaScript to "chew it up". The script I linked will set everything up correctly.