One of the common problem in changing SharePoint authentication, is raise when you change the authentication of SharePoint web application, then you can not manage the site because you are not site admin anymore with new authentication. its little complicated to make one Windows Live Users to site admin for first time.
Shetab Windows Live Authentication for SharePoint allows you to specify site collection administrator during installation by his/her email. It cause you get administration privilege as soon as you sign in to SharePoint site if you validate your email. You will not get "Access Denied" error and you can manage other users very easy.