Twitter not displaying user or posting to wall

I saw that another user also had the same problem with this plugin. When I sign in with twitter, the username shows as “.” and when I make the comment, it shows up as “Anonymous” and doesn’t get posted to their twitter wall.

This is the only reason I purchased a WPMU membership and would really like this plugin to work so I don’t have to use a service like Disqus or WordPress to do this.