Problem using News module : index.php/index.php in url ?!

Hi everybody (please excuse my English)

I'm a brand new Contao user and I love this CMS but... I got a problem using the News Module.

I followed the procedure to create a page including a news short list.
I also created my news reader module and page.
The news archive that I created points to the news reader page.
http://nsa25.casimages.com/img/2011/...2511363103.jpg

I can access to my news page with the short news list.
So... everything looks fine to me, but...

when I follow the "read more" link to the full news, I got a blank page.
Not surprisingly, since the URL of the page is really strange :
...mysite/index.php/index.php/news/items/thenewsiwanttoread.html

Why is there 2 times index.php in the URL ? If I remove 1 manually, I can access to the page (with CSS path trouble, but I should be able to fix that).

Does anyone have an idea about where I got something wrong ??

Thanks a lot for your help

Vinny