Alright, so the issue is this: I go to a thread, I can post on it normally. Then when I come back a day or so later, it starts asking me for "form resubmission" to view it. And then it does this:
I already lost access to one thread this way, wrote a message to someone about it. No answer. Now I got it on another thread too. Its getting really frustrating. Please, someone, help me.
Eta: forgot to delete my "pinned" top bar from the screenshot. Meh.