Blog link in Facebook incorrect after upgrade to latest version

Hi,

Since upgrading to latest version when we autopost the link in facebook is incorrect and therefore results in a 404 error.

This is the link structure we are getting:

ourdomain.com/administrator/blog/blog-article-title.html

It was previously correct as follows:

ourdomain.com/blog-article-title.html

Please advise how to correct ASAP as we now have a deadlink on Facebook.

Thanks