Unfortunately the problem does not appear to be a routes problem but a
‘not initialised’ authlogic problem.  By changing the App.Controller
methods I have now moved the problem to the create procedure after
logging on.  I managed to create a user from the console and Authlogic
filled in all the ‘special’ fields.  But logging on and calling the
create session (call Authentication) causes the same error
undefined method `underscore' for nil:NilClass
which occurs when calling @authentication.save.

def create
    @authentication = Authentication.new(params[:authentication])
    if @authentication.save
     flash[:notice] = "Login successful!"
     redirect_to root_url
    else
     render :action => :new
    end
  end

My App.Controller now has the session/user checking methods and cause
no problems. (so far)

  private
    def current_user
     return @current_user if defined?(@current_user)
     @current_user = current_user_session && current_user_session.user
    end

    def current_user_session
      return @current_user_session if defined?(@current_user_session)
      if defined?(Authentication.Find) then
       @current_user_session = Authentication.find
      else
       @current_user_session=nil
      end
   end

I am using rails 2.3.8 and Authlogic 2.1.6, and I like to try and keep
to one word descriptions of models and controls so Authentication
instead of UserSession.

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