Suffering the same errors, got this from the logs:
mod_security: Access denied with code 500. Pattern match “\\\\.php\\\\?.*=(http|https|ftp)\\\\:/.*\\\\?” at REQUEST_URI
[uri “/wp-admin/post.php?action=edit&post=1&_wp_original_http_referer=http%3A%2F%2Fwww.stefm.nl%2Fwp-admin%2Fedit.php%3Fdeleted%3D1”]
Still no solution for this error?
