Maybe this is an old one without resolution so far but I often see threads or forums with multiple threads showing unread messages available even though none really are. I tend to press the "Mark all as read" button when exiting a forum but will return later and see red dots again for threads which have had no new activity. I'll notice that posts within the thread marked as new are one's I've already seen. I know this will happen after pressing the back button but I don't do this. Is it me or is this a bug?