[eluser]mipa[/eluser]
Yeah, I know, unfortunately, it's "confidential" company stuff.
Regardless, we've been narrowing down the problem. We believe it stems from our unorthodox inclusion of another extension to the Controller class.
Situation is like this: we have multiple applications sitting on the framework. Two of our applications share the same extended controller functions, which we added to the "MY_Controller.php" file. However, one of the applications still needs to extend the Controller class, so we created another class Base_controller. So, our controllers extend Base_controller which in turn extends MY_Controller. We're currently trying to look into a better way to manage this situation.