Well that was a nasty surprise.
Our server got hacked and somebody got very nasty indeed in there. Luckily, tech support at the webhost end restored the files, and then some of the security experts from Geek Feminism Blog have gone over things with a fine tooth comb, taken a full backup of every single bit of the database, and done many other clever and sneaky things to harden it the hell up.
So, we’re back in business for now, and if we do get hacked again there’s no need to panic. Which I did, rather a lot, at first.