Thread:Project:Support desk/All pages yield gibberish in Safari and iPhone but not in Firefox/reply (3)

I think there's something wrong with gzip compression being double applied to your page or something.

Try setting $wgUseGzip to false in LocalSettings.php (This will only fix it if you're also using file caching i think, otherwise that setting does nothing).

Otherwise you can also try disabling gzip in your apache (or whatever webserver you use) config.