In the old version, I would go to the site and look to see if there were topics of interest I hadn't read. If so, I would open one in a new tab. If I decided to reply, I would then log in (in the thread window) and post my reply. I would then delete the tab which would return me to the main one. At that point, it still showed I was not logged in but selecting "Mark this forum as read" would not only do it but now would show I was logged in.
In the new version, following the same procedure does not show me as logged in after clicking "Mark this forum as read" but does show the threads as being read. However,if I refresh the page, it now shows I am logged in but the threads are no longer marked as read. I have to redo "Mark this forum as read". Strange.