[eluser]jedd[/eluser]
[quote author="asylmottaket" date="1257834016"]
The main issue is that nothing works..
[/quote]
Yes, I can see how that could be a main issue.
Rather than have Base_controller and Backend_controller, why not just have MY_Controller - it's nicely documented in the user guide, lots of people use it, many tutorials refer to it, and (most importantly) it tends to Just Work.
If you're confusing yourself by multiple extensions to the controller class, think of this as nature's way of encouraging you to be less effusive in your usage of the
extends feature of PHP.
I'd also suggest that you really really really want to avoid declaring two controller classes in one file. Ever.