I'm trying to use your plugin on a site hosted at the web host WPEngine. It's staged for now at http://cougarjuice.wpengine.com. WPEngine does some caching for performance, not via a plugin that I can turn off or configure..
I brought this up and they said: "Ask the developer if there are certain paths or files we can exclude from our caching system to get the plugin working. Once you get that information to us, we'll gladly put those cache exemptions in place for you."