APEX

I'm having some trouble with the css files that are uploaded throught the application builder. When uploading an update to an existing css file, the file is not updated in the browser. Even after closing all browser windows and deleting the temporary internet files the new version is not loaded. I've even tried deleting the file from the app builder and holding the control key down when refreshing the browser and it still loads as if one existed. We currently have 3 seperate server environments and it works fine on 2 out of the 3...could this be a setting on the application server when the file is fetched from the database? It is currently calling:
wwv_flow_file_mgr.get_file?p_security_group_id=721404936311769&p_fname=iPRACA.css

I know the correct file is being uploaded to the database because when I view the detailed report in the application builder and click on the file name, the updated version is displayed in the text area. But, when I click on the download icon and open the css file to view, it is still the old version.

I'm currently using APEX version 2.3 and OAS 10.1.2

Any help would be greatly appreciated.