[TYPO3-english] Typo3 & realurl: Page not found in IE - other browsers work fine

[Mario Jack]

I have encountered a very strange behavior of the IE and don't know how to solve it:

I´m working on a typo3-site (alkitronic.com). The site is multi-language and has realurl installed. The problem is: When i open a subpage in the IE and try to change the language - realurl generates the wrong url and shows a "Page Not Found"-Page... but this only happens in IE, other browsers work fine.

Example: 

Start-Page: alkitronic.com/drehmomentschrauber-hersteller/
Language change to english: 
IE-url: alkitronic.com/drehmomentschrauber-hersteller/en/unternehmen/
Chrome-url: alkitronic.com/en/unternehmen/

can somebody help me?