See my earlier post. It killed my login page. Only way to access the site was to use FTP and delete the plugin folder entirely. The login page returned after doing this but I lost all my SEO changes. Not good
Goto “Developers” tab on the homepage of this plugin. I selected 1.4.13 version as that was working for me earlier.
(Can’t paste links here otherwise would have done for the benefit of single click navigation ?? )
Go to Settings -> Permalinks and hit save, that should fix it. The rewrites have been updated and apparently the upgrade doesn’t kick the rewrite flush as it should.
By the way: if your XML sitemap is blank, it’s still working, it’s just the XSL that’s not working, which is the stylesheet that makes it human readable.