Hmm if it is empty, then that is very strange. Are you uploading to your root directory or to the addon domain directory? Did you have an previous WP installed through Fantastico (since assuming you are using Fantastico?) and deleted the files manually and not through Fantastico?
Sorry for all the questions. If anything, submit a ticket to support also about this, since they will be able to actually go into your server and see whats up. =)
http://desk.surpasshosting.com/