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Really??  That's strange - if you PM me the domain, I can do a bit more digging.

Hey Dan, I have some experience with a few of these. Mainly phpBB and vBulletin. I think both are pretty well and it is really all about flexibility in modifying SEO needs, in which both can allow you to do easily. I personally like vBulletin and their community, but it could be quite expensive and does hog up resources. phpBB is open source last time I used it (years ago), and it is great to build off of and there are plenty of successful sites running on phpBB. Bottomline is your budget. If you have the budget go with vB, if you are just testing something..try phpBB. They are both pretty good.