CI 2.1 Updated: routing problems, 404 pages

[eluser]Kunzilla[/eluser]
Hi,

i updated my CI 2.1 to the latest release and i get many 404 error pages. Mostly on urls with more than one parameter (/foo/bar). Controler overviews (/news or /news/index) works fine...

the checkup with print_r($this) show this:

Code:

[uri_string] => news/archive/tech
            [segments] => Array
                (
                    [1] => news
                    [2] => archivetech
                )

            [rsegments] => Array
                (
                    [1] => news
                    [2] => archivetech
                )

This is a realy strange thing. I updated the system and index.php Files.

maybe someone can help me!

thanks