Hi,
I've noticed that the newest version (and probably older as well) has problem with marking posts as read in threaded mode. If you want read new topic, you'll see first post marked as read and rest of posts as unread.
If you click random post in tree (from libs: topic_tree.inc), all posts will be marked as read. All icons will be "nonewfolder.gif" and icon "new.gif" will dissapear.
You can check that bug on your board.
