As you have noticed, the forum doesn't look quite the same as before.
We were using a very old version of vanilla forum (2.0) and search feature was no longer available. So I decided it was time update the forum. I just moved to 2.1 version, which is still old but I didn't dare jumping from 2.0 to 2.3 in one step.
Moving to 2.1 wasn't that easy already: a few plugins no longer work, and I idn't manage to replicate the old style of the forum. I will try to move forward to 2.2 and then 2.3 series, step by step, so don't be too surprised if the forum doesn't behave is it used to... but feel free to tell what you think here!