Hi, I have found a solution for this problem. In a other thread I found this:
I’ve updated the issue in the NextGen file: ngg-config.php
from:
require_once( WP_LOAD_PATH . ‘wp-load.php’);
to:
require_once( WP_LOAD_PATH . ‘wp-admin/admin.php’);
It works fine and without the HTTP Error Message during the images uploads ??
Greetings,
klenkes