Trying Edge Rails but get unexpected behavour

Hi all, I've create a rails app (with rails name), then I checked out
edge-rails into vendor/rails.
Also I added the line do |config|
  config.load_paths += %W(
#{RAILS_ROOT}/vendor/rails/activeresource/lib )

in config/environment.rb.

Finally I ran: rake rails:update

So I think that's all I had to do to have my app using edge-rails.
Well, after stand up the server, I go
to http://localhost:3000/ and all seems ok, but when I go to 'About
your application's environment' link,
I don't get any response from the server, neither the request is showed
in the console.
But when I close the server (Ctrl-C) the environment information is
showed at the browser and the console writes: - - [04/Dec/2006:16:11:24 CET] "GET /rails/info/properties
HTTP/1.1" 200 999
- -> /rails/info/properties

Any idea about what's happening? Also I didn't get javascript errors....