Losing $config values on IIS6, Windows 2003 Server

[eluser]Unknown[/eluser]
I've developed a site which runs fine locally (on a WAMP environment) and also works fine on an older IIS6, Windows 2003 Server, PHP5. However, on our new Windows 2003 Server (IIS6 PHP5) I get a very curious problem. It seems that the values of the $config array are not being picked up - by the time the index.php page is reached (when I tried echoing the values of the $config array) they had dissappeared. I also placed an 'echo "Hello"' statement in the config.php page to check that it was running through that - it was. So the $config array is being populated, but is being lost at some point.

So when I use $config['base_url'] to find stylesheets etc, they just don't work. Has anyone else experienced this? I'm really in need of a solution for this, so any help is appreciated.

Regards

H