Something weird is going on: For some reason, I am only able to access new replies from the main page, but not from the individual subforums. For example, in a thread at diff.eq, my own recent reply can only be accessed from the main page (as the last one posted), but is not accessible from the diff. eq forum. If I go in there, only Leonhard Euler's last reply is there. I've registered the same happening on a few other threads as well.