Images lost

I have this blog: https://www.lanfreemarathon.com/
The theme is i3Theme 1.3

After the upgrade, I can’t view any images. if I change the themes or if I write the url/image (example: https://www.lanfreemarathon.com/wp-content/plugins/nextgen-gallery/nggshow.php?pid=714&width=490&height=324&mode= ) I view my images. Why? I haven’t idea ??

Thanks!