I found a way around the Bad Gateways on the forum:
1) When going on the superpower list, open two or more tabs.
2) Log in with all of them at once.
3) The moment you get onto the site, use one to go on the forums.
4) As soon as you get on forums, go on the Private Forum (if available). This puts you on a different server, protecting you from the cursed Bad Gateways.
5) Do what you want on the forum, then return to the main ones without using the"back" button. This keeps you on the special server as you check the normal forums, but you cannot use this tab to go on the main site, which is why you open multiple tabs. This also clears a Bad Gateway for someone else, most likely on the forum.
I've been using it for a while, but forgot to tell anyone. Hope it helps others; it's 100% effective for me.