[Plugin: WPML] – Url rewriting and translation error

Hi

I am using WPML in one blog to manage different languages, and I get trouble with the management of url rewriting and the translation module WPML. When I read an article and want to see it in another language, the right article is displayed, but the url generated is wrong, as it includes the category in a different language.
For example, I read the article in english, change it to french and have a url :
example.com/fr/category-in-english/post.htm although the article is displayed as the correct url, which should be example.com/fr/category-in-french/post.htm

Here is my specifications :
Wordpress 3.5.1
WPML 2.6.1
WPML string 1.5.1
Plugin SEO : Yoast
Woo theme

Thanks a lot in advance for your help.
Florian