Recently the old reddit szopped working for me even after going to account settings and opting out of new design again (it was already marked as being opt out) across all my devices. Even after manually navigating to old.reddit.com, clicking any link would take me to new again. I had to install special extensions to reroute to old reddit everywhere.

Same thing happened to me, this fixed it: https://www.reddit.com/r/help/comments/1odehgj/is_old_reddit...