I installed this plugin before we updated to WP 3.8 and it works great for all authors except one. Here is an example: http://iteachu.uaf.edu/grow-skills/blogs/ — All authors go to the custom authors.php page except for Heidi. Clicking on Heidi returns a search result for her posts. She is definitely an author on many other pages though. There is nothing unusual about her account that should set her apart from the others.