When I bring up a topic in Chrome by following a link from an email notification and then hit Reply, it takes me to the community home page. I was on via VPN at the time and it recognized that I was logged in to the forum site so it was not taking me to a login conversation. When I left that page up and followed the link a second time, I was able to reply to the thread.
A similar thing happens if I am not logged on through VPN. Hitting Reply takes me to the login page which makes sense but on completion of the login takes me to the homepage. I have to reenter the link to the desired thread and Reply again to enter my reply.