Please add a page that lists all forum threads with unread replies. Maybe as an option in the "Show Content Since" filter on the "New or Updated Forum Threads" page. The old forum had this functionality.
The link to a specific reply on the "New or Updated Forum Threads" page is quite unreliable too. Sometimes it just opens the thread without jumping to any specific reply. Sometimes it jumps to an old reply that I already read days ago. I've even noticed a situation when it tried to jump to an not existing - maybe deleted - reply (e.g. the URL ended in "#c2" but there was no comment #2 visible in the thread, #3 followed right after #1).