WordPress Response Code 404 on Facebook

Hello forum

‘m new here and have a problem with Facebook

Since the update to version 3.8.1 I get for newly published articles the error code 404 in the Open Graph Object Debugger or the post on FB “page not found”.

However, a header checking is the status code 200 OK – item is accessible without any error messages

older pages / article / category links work – only newly created content but not

here’s a link with code 404
https://developers.facebook.com/tools/debug/og/object?q=http%3A%2F%2Fwww.der-beauty-blog.de%2F2014%2F02%2F09%2Fphytolaque-fuer-empfindliches-haar%2F
http://www.der-beauty-blog.de/2014/02/09/phytolaque-fuer-empfindliches-haar/

and one of the works
https://developers.facebook.com/tools/debug/og/object?q=http%3A%2F%2Fwww.der-beauty-blog.de%2F2014%2F01%2F22%2Fsystem-absolute-anti-aging-annemarie-boerlind%2F
http://www.der-beauty-blog.de/2014/02/09/phytolaque-fuer-empfindliches-haar/

a newly installed test blog with WP 3.8.1 works perfectly

Who had ever post these problems in the WP links on Facebook and can help me further.

Or had these headers problems after an update?

Thank you ever