I added the params[:origin] to the email_preferences if there was no user, let me know what you think

sign_in.rb

def sign_in
    params[:return_to] ||= "back"
    save_return_point
    if request.post? and perform_login and params[:origin] != 'email_preferences'
      #report_from_server :category => 'login', # User logged in
      #  :action => 'success',
      #  :label => "user_id=[#{current_user.id}]"

      redirect_to_return_point
    elsif request.post? and perform_login and params[:origin] == 'email_preferences'
      redirect_to :action => 'email_preferences'
    else
      if params[:ajax] || params[:dialog] || @dialog
        @dialog = true
        render :template => "/user/login_2014_dialog", :layout => false
      else
        render :template => "/user/login_2014", :layout => "app"
      end
    end
  end