I've just done an update of Drupal, the software which runs this site, from version 4.7 to 5.1. Whilst potentially quite boring information, this might mean that there are a few bugs here and there.

If you find any, please let me know!

In fact, I've already noticed one... it seems that the blog categories have stopped working...

Edit: I think most of the bugs are ironed out now. CSS really is quite a mystical beast.