WBN Logs You Out?

I usually log in on the main page of WBN or on the main page of the forums. From there I usually go to the main forums page and then into a sub-forum, like General. If a topic has a new post since my last visit, and I click the little yellow icon to the left of the thread topic to take me directly to that post, WBN will log me out.

I'm on a WinXP box using Opera 9.21. I do have cookies enabled so I'm not sure what the problem could be.

Same issue here with Firefox on my Mac.

Also, can we get the phpbb timezone option added to our profiles? I think most of us don't go off Australian time :)