[@ipstenu Moderator 15 years, 11 months ago]

Dump all your cookies and cache. If you’re using Firefox, you can actually leave your cookies open while browsing, so with that open, log back into WP.

Make a note of your cookies.

Log in to BB. See if the cookies have the same name. You should have about 6 or so called wordpress_LONGSTRING and if you look at those cookies, the folder locations will be / or /forums or /blog etc etc. If they’re NOT the same cookie name, then you have missmatched AUTH keys in your forum.