it may not be a bug. sometimes when u read title of thread u just intend to see what question is asked originally without opening full thread. so that may be helpful in that case.but yes even i wud prefer first UNREAD post and if possible all posts after i last saw the thread. and may be quick reply included as well. LOL. asking for too much. but then i can do away with multiple browser tabs.
heh... ok. i am also considering installing the add-on which would show the first post of the thread in all the pages. important to remind the users of the original motive of the thread...the problem is that it would result in duplicate content multiple tabs is better than multiple windows. that's what u would have to do in internet explorer 6.