I had exactly the same issue last weekend!
Never got the channel overview back as I wished on that project.
Next to some other issues I had to face with (lost surround panner after duplicating tracks, kicker-keystrokes stopped working several times until restart…) this weekend-postpromix was (after a longer break at all) my last try with the current N6, atm I am back on PT, and really get used to it more and more…