I always clean out cookies after each session here.
I log on from 3 different computers and still get thrown out if I click on any button except the back arrow button on my browser.
If, say, I click on the forums button I get throw out.
If I re-log in I have to log in again on the next page that shows up.
If I am thrown out, and hit the browser's back arrow, I return to the previous page and am returned to my logged-in again status.
Also, sometimes when I access the forums page to look at the status of the different forums, before I log in, I see some recent posts like in the DIY section that were posted up to a few hours ago. When I log in to look at those threads, I don't see any posts from the last 12-or-so hours.
When I look at the forums page again, they are still there, but not when I access those threads, until after i have shuffled back and forth a few times.