So while I'm logged in, the list of threads are stuck at what they were like 4 hours ago. If I log out or go into incognito mode, the threads will once again appear as they should...but if I log in again it goes right back to the previous (incorrect) listing. I'm on Chrome, I've cleared browser data/cookies/etc.
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Nevermind, found the problem. Looks like someone decided to flip the "hide threads started by users on your ignore list" switch after all these years... (without an option to disable that, naturally)