[Plugin: WordPress SEO by Yoast] Exclude post types not working

I have excluded some post types and they are appearing in my search results.

I have checked in Webmaster Tools and it seems that the post types are not included in the XML, but the results are showing.

This was working fine before the latest updates.

How can I fix that ?

Thanks.

http://wordpress.org/extend/plugins/wordpress-seo/