I'm wondering if the caching is working proper for the framework. In an earlier version of Fuel, I set caching to true and when running my scripts I would see a cache/ca/ folder appear, presumably containing system/directory vars for the framework. In this latest version of Fuel, I again set the cache to true in the config but this folder is no longer created. I want to know that the caching is working proper for these system setup vars.
The only caching that is part of the framework is the finders path cache.
Which should be controlled by the 'caching' parameter in your config/config.php.