So for virtually every thread started in the past few days the "new posts" button takes me to start of thread. Older threads take me to some post in the thread (like this one, Post #37).

(begin speculation)I wonder if some counter max-ed out somewhere, or the board hit some kind of overflow. I note that we're now over 16 million posts.... could there be a register overflow around 16 million that causes later posts to not record as last read? (speculation off)

Sure hope something is found soon as reading FT has become a real chore.