Martijnchel on "[Plugin: WordPress SEO by Yoast] The SEO title output not working anymore"

After updating to the latest version of the plugin the SEO title output does not work anymore. Only page titles as put in the editor are used, nothing that is added in the SEO plugin.
Force rewrite checked does not offer a solution, also not with the code in the header as described in the faq.
I cannot get the SEO titles working anymore, as they did before the update.

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