index.php not being displayed – “unsupported form of compression.”

Hi

I have a WordPress installation that’s functioning on the admin site, and when you reach the site’s pages via urls : https://www.tadhgcooke.com/shows/

I’ve reinstalled automatically, and twice manually. I’ve updated all plugins. Deactivated and reactivated individually. I’m utterly stumped by this.

The only warning I get is this, via firefox :
The page you are trying to view cannot be shown because it uses an invalid or unsupported form of compression.

or this via Chrome :
Error 2 (net::ERR_FAILED): Unknown error.

Any help, light shed or debugging info would be greatly appreciated!

Thanks,
T