kjmagic13

My apologies, I created a new topic with this exact issue.

Consider the following changes to the action_admin_init function in the plugin’s index.php file and replacing the admin_init action with admin_enqueue_scripts per Targeting a Specific Admin Page

function action_admin_init($hook)
{
	if( 'toplevel_page_wp-ultimate-csv-importer/index' != $hook ) { return; }
	...
}
add_action('admin_enqueue_scripts', 'action_admin_init');

I had the same issue while trying to mass import products into eShop. Around line 539 of the csv_importer.php file I, using WordPress’s is_serialized() function, edited the create_custom_fields() function to unserialize any values to be added to the post meta. In turn add_post_meta() re-serializes any arrays passed through the $meta_value (third) parameter.

function create_custom_fields($post_id, $data) {
    foreach ($data as $k => $v) {
        // anything that doesn't start with csv_ is a custom field
        if (!preg_match('/^csv_/', $k) && $v != '') {
            // if value is serialized unserialize it
            if( is_serialized($v) ) {
                $v = unserialize($v);
                // the unserialized array will be re-serialized with add_post_meta()
            }
            add_post_meta($post_id, $k, $v);
        }
    }
}

You could also set it to perform a certain task depending on a specific key.

if( $k == '_eshop_product' ) {
    $v = unserialize($v);
    // etc., etc.
}

Hope this helps.