If you're using RocketTheme's optional RokGZipper plugin, please disable it. This plugin is a security nightmare, I've told them and they don't agree.
What it does is that it requires you to allow execution of arbitrarily named PHP files all over your site. However, this means that if an attacker manages to upload a sinister file (like a C99 variant, usually named inconspicuously e.g. README.php) anywhere on your site, you have just became a sitting duck. Besides, RokGZipper is using PHP code to deliver GZip-compressed versions of your PHP and JS files. Guess what? Using .htaccess Maker's option to automatically compress static resources is far better and far more efficient. Instead of using inefficient PHP code, the .htaccess method uses Apache's blazing fast GZip module. Moreover, Apache caches the compressed static resource in memory, meaning that your side loads faster. Double win!
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!