I've just checked, and although the syslinux.cfg file is smaller in the cd version (because of the lack of compiz modes) the file is not empty. I would suggest opening the file in notepad as a test, even though wordpad should open it better than notepad. With Nano, if you have not specified the path or have not changed to the directory, it will assume you are opening a new file, hence it is blank. Also you should check the md5 of the iso to be sure it is not corrupt.