Ah, thanks! I’ll hopfully get back on track now.
Switching to the default theme worked ok. Something has obviously gone wrong without me knowing in the theme I had developed. It was working fine for a while, but I shouldn’t be surprised as I’m not really on top of the code. Still don’t now what has actually happened though. WordPress won’t allow me to switch back to my theme, and my back-up files aren’t accepted either.
I’ll try to work around this, or start up a theme from scratch and learn from the experience…
I’m running two WordPress installs on my site, one in the root folder and a blog in a separate folder. They used the same theme, but I had deleted some parts of the WordPress Loop in the index file in one of them without editing the title of that theme. It worked for a while, but possibly there is a conflict there?