We were in a rush while doing the update and did not read the update instructions for the forum properly. This caused the update to fail and the entire installation of the forum to break.
It was just a minor update, but if you are doing it wrong, it fails. Usually a update like this is done in a couple of minutes.
We are planning a major update of the board some time in the future (going to phpBB 3.1). But we will prepare this a lot more than the one we did for this one and inform you before hand when it happens.
There are still a couple of issues remaining in the current installation of the board. Such as the broken search function. We will fix that as soon as we can.