Custom Configuration File fails to load

So, I've taken the same software and installed it on 5 different servers, 2 are Windows servers running IIS 6, and two are Linux servers running Apache.

I'm attempting to load a custom configuration file to change the default toolbar, so I'm setting the fckEditor.config.CustomConfigurationsPath = "/fckCustomConfig.js" before calling the create() method. (I'm using the coldfusion CFC implementation).

Anyway, the two instances being served from the Linux box work fine. The two instances being served from Windows do not load the custom configuration file. There are no javascript errors, and the file is never accessed at all according to the web server log files.

Can anyone else confirm this?