I just upgraded to the latest version 2.1.3, and found that the 404 page is no longer working. any time I put in an invalid page, it's instead redirecting back to the front page. I thought it may have been something I put in the theme customization on my 404 template page, so I switched themes, but it still makes no difference, and all invalid links get redirected to the main page. Anyone run across this problem? Anyone have any solutions?