I talked with one of the mods over there. They're not sure what the deal is, but that is happening for other visitors as well. The only thing they could suggest for now is to make a new account (you could probably still use your same username) in order to post there.i just thought about checking on what the hawkeye brain trust is up to on the main thread only to face the same issue “You have insufficient privileges to reply here.”
My guess is there was an update that split the Rivals main boards from all the branch team sites, and it somehow blocked out certain posters.