> certain file type extensions may cause the user profile page not to load There is no reason for this. They should always hit the same controller and be serve

> certain file type extensions may cause the user profile page not to load There is no reason for this. They should always hit the same controller and be served as text/html. Why would the username ever influence this? If that breaks an existing page then you either shouldn't have allowed the username to be created with the same name as an existing page (exactly what GitHub does) or shouldn't have created a page with the same name as a username [depending on which came first!] - or better yet, had them in a separate namespace so they cannot conflict in the first place.