Older Version problems

I'm moving some scripts to a new server but the PHP installation on the new server is actually older than the version I currently have installed on the production server. I'm moving from 4.2.3 to 4.1.2. In my file upload scripts I can't seem to get any $_FILES values out of my upload. The scripts don't error out and the file appears to transfer. I've enabled E_ALL and logging. Uploads are on and max upload size is sufficient. When I check $_FILES['filename']['tmp_name'] or ['size'] or ['name'] or ['type'] they are all empty. Did I miss something in the ini file somewhere? I'd really hate to upgrade at this time as this came from a Red Hat 7.3 install and I'd hate to lose all the functions that are already pre-compiled into it (gd, mysql, etc) Thanks, Ed