Quote Originally Posted by Clootie
No, seems each time new window is opened with forum page -> "last visit" field in DB got updated. So even opening first topic in new windows shows expected result, but opening one more new window results in "no new posts available".
I think this is usually how the standard "new posts" feature work on most forums. On our forums at afterwarp.net we use database tracking of unread posts, which although server extensive, is very accurate, but we don't use PhpBB, so I don't know what to suggest here.