Thanks for your answer!
I'm using Google Chrome 15.0.874.121 on Ubuntu 10.04 linux. I have the same error with Firefox 8.0 on a similar (but not the same) operating system.
The issue is when I open a forum's subforum and try to jump to the first unread post of the thread with the little firstnew.png icon, it just opens the thread and I have to search for the new messages.
The second problem is annoying because it takes two steps to 'mark' a read thread as read. I have also reproduced this problem with Chrome and Firefox. The steps: find a subforum with one unread thread > read it > navigate back to the forum index in one step. The thread seems still unread but we read it before.
Let me know if I could help you in the debugging.
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