XP, Firefox 0.9

Say I'm logged in, and I'm looking at /forums.cfm, and I open The Bar in a new tab, in the new tab I'll be logged out. This happens occasionally, but not always.

Also, I just clicked on an nzm link in google, and I was logged out when the page loaded, when I should have been logged in. (I assume, because I never actually click on logout.)