Trouble implementing a new controller in an existing project.

[eluser]jedd[/eluser]

Yeah, I just cut and paste a simple hello world snippet I found online.

Well, try cutting-n-pasting from the [url="http://ellislab.com/codeigniter/user-guide/general/controllers.html"]CI User Manual section on Controllers[/url] and see if that fails in the same way. If it does, then you're right. If it doesn't, then the problem is the dodgy code you've picked up.

I believe it's something happening before Codeigniter is deciding which controller to use.

Anything is possible, I suppose. It might be related to the number of days since the Solstice.

Is there an .htaccess file in play here?

If you do a clean CI install in a directory, do things Work As Expected?