Codeigniter default uri problem

[eluser]Derek Jones[/eluser]
Thanks Chris, for linking to this thread in the PM you sent me. The barrage of communication we get makes it very difficult to try to keep it all in memory. :-D

The 404 error you are getting is a CodeIgniter styled error - are you using a custom 404 with .htaccess that just looks like CI's, or is that legitimately CI? If the latter, then I'd go through _validate_request() in Router.php and step through the code, seeing what is being sent to that method, and why the processing is failing. That's the show_404() that seems the most likely to be getting hit.