Sometimes a thread will not be visible to me while I am logged in. For instance, this one: https://robertsspaceindustries.com/spectrum/community/SC/forum/3/thread/what-was-the-reasoning-behind-the-archimedes-losin If I try to load that thread right now I get "You entered a black hole". But if I sqwitch over to another browser where I'm not logged in I can see it just fine. If I then log in with that other browser, I'm back to the black hole.