Unless someone is willing to pay a licence fee, Im yet to find a free and better forum software..
Simple Machines Forum, hell even PhPBB is better than this.
PhPBB? Are you kidding me!?
no im not, at least it works properly, even if it is somewhat insecure and lacks a few features. At least you can hack the features in and sort the security out if you know what to do.
I still maintain that SMF is the best of the free PhP based Bulletin Board systems. I use vBulletin myself, found it less crashy and prone to corruption than IPB. IPB used to died a horrible death every month or so on my website. vB i pretty much set up and let run aside from security updates.