The problem appears to be down to a specific query that has just blown itself to bits for some reason. It's the 'Genre Selector' query, so the ability to search for recent updates in a specific genre is presently offline while I figure out a better way to deal with it.
There may be other issues that crop up as a result, that I'm as yet unaware of so if you find something that isn't working it could well be related. Given the time constraints of my real life job it's not likely that this will be fixed any time soon (ie, definitely not within the next few hours) as it will require a rethink on that particular area of code.
I suspect basically that finally there are just too many entries in the database for that particular query to handle well. Don't worry though I won't be deleting any!