On the old version o the form, once I had visited a form, only new threads, or threads that had been added to showed the unread flag. Now threads I am not interested in always show unread? Any chance of changing back?

Not sure if this will help or if it will solve your problem but give this a try . Bookmark this: search.php?search_id=newposts Then you only have to sort through the latest posts without having to search through unread posts. Just click on the flag to take you to the latest post in the thread.

If, while logged in and before leaving the forum, you click "mark topics read" under the "go to page" link near the top of the right hand side, then the next time you visit only new threads, and ones that have been added to, will be flagged unread.

Hope that helps.