Hi Donncha, I noticed that even though I have Super Cache in ON mode and both Preload Cache and Super Cache Compression enabled, there are no Gzipped pages/posts/feeds served to either my browser (logged out) or services like http://www.whatsmyip.org/http_compression/ and http://ismyblogworking.com/ ( but it does detect “WP Super Cache is active.” 😉 )

I checked the /cache/ folder and all .gz page/post files (except feeds!) are there and have the proper content. The shared server has zlib.output_compression installed but it is turned OFF for my domain. All .htaccess rules are in order as far as I can tell.

What else could be interfering ? Thanks for your thoughts 🙂