Site only loading the default controller

[eluser]Rok Biderman[/eluser]
I have a similar setup and this is a list of things i would check:
.htaccess (it works without the ? after the index.php on win hosts, but somehow fails otherwise)
there is some fiddling with either making

Code:

$config['uri_protocol'] = "AUTO";

or

Code:

$config['uri_protocol'] = "REQUEST URI";

for the .htaccess to work properly.
config/config.php settings
index.php settings
config/routes.php

If it works on your dev environment, chances are very good the problem is in one of those. Basically on what you just told it has to be somewhere in the routing.