Thanks to Lis for pointing out that comments were not working on my blog, and also diagnosing the problem. It seems that the theme I was using did not work on the rather ancient version of WordPress that was installed by OpenHost on my hosted webspace.
So I downloaded the latest version or WordPress onto my machine, and also FTP the whole WordPress directory from the server into my local site. I followed the upgrade instructions into my local directory, and loaded it back up to my server. A quick database upgrade, and re-installation of the clean press theme, and here we are, up to date with the theme I want! Admin is a bit different, but I got this post up OK.