Originally Posted by Cyber Fucker

You have X-Frame-Options: SAMEORIGIN

Assuming it's not a php it means that your webserver is set this way. Either you or your web hosting provider has added it to the http headers. Some people do it to protect their stuff from hotlinking/displaying within other websites (bandwidth thieves). But as we know TheHun displays galleries within a frame (hunbar etc)

I'm not aware of what is the percentage of web browser that follow this rule, but many modern are. So this means that your galleries would not display anyway for many people browsing TheHun with up-to-date browsers. That's why your galleries were disabled/deleted.

The future solution to avoid this problem is to either remove this header or to make an exception rule in your webserver config to alow TheHun.