I've just seen a few Facebook posts and received a few PMs and I thought I'd investigate the the search not working problem. It turns out the forum providers are upgrading servers and they say it's to do with them migrating all forums to new hardware.
They are currently in the process of rebuilding the indexes used for searching and without the indexes there is no searching (seriously it would put a lot of strain on their architecture to do normal database searches). Obviously the bigger the forum the longer the indexing will take.
I launched my ocarina festival Kickstarter today and I'd appreciate it if you would consider backing it and sharing it with your friends and family too. The goal is to not only cover some costs of the festival, but also use Kickstarter to promote it. Even if you're short on money, pledging $1 will get you all of the updates and hopefully later you'll consider increasing your pledge.