Public Service Announcement:
I've heard from a few community members that some people are having some issues commenting / replying to threads because the reply box doesn't appear at the topic.
I've encountered this buggy behavior myself and I've found that logging out of and back into the forums returned my reply boxes to me. :)
If you encounter issues with the forums please 1. make sure that you can replicate the behavior after logging out/back in, and then 2. report it to me so that I can compile the information and report it to the osTicket Team.
Thank you!