Just before going on holiday a couple of weeks ago, I got a little email in my inbox that indicated my blog had been hacked (a “you just reset your password” warning). A quick look around the FTP server soon confirmed this.
By God’s grace I spotted it almost immediately and was able to lock the intruder out and get things back to a vague semblance of normality. Today is the first day that I’ve got things to the point where I can actually post new blog posts. Maybe one day I’ll even get around to customising the theme from the default one (if you’ve been wondering why the appearance changed, this is why).
Let this be a lesson to you: always keep your WordPress installation fully up-to-date. It may be a hassle (and these days it’s not even that much hassle!) but it’s a lot MORE hassle to have to reinstall from scratch.