Autoload not working

[eluser]Unknown[/eluser]
I'm running into a bit of a problem. I have FreakAuth working properly but it seems that I'm unable to use the freakauth->check() in any of my other controllers. I have the FreakAuth lib loaded in my autoloader.php and I'm able to login a superuser, admin and user (based on three accounts I've created). Can you offer some advice as to where I can look to try and figure out the issue?