Dan (and others...) There is an option in UBB regarding the setting of cookies when running multiple UBB's on one domain:

Cookie Option
If you are setting up more than one UBB on a domain, you should elect to have cookies set to the precise directory that that UBB is running in. If you are only running one UBB on your domain, then you can set your cookies more broadly. The default is to set BROADLY.

It looks like you have that option set incorrectly as I receive the same cookie for all the seperate boards on FT.... That would certainly explain why it thinks all the posts are new...