Yes, I have the same issue, on my descent (VNAV mode), I put my throttle full back to not overspeed and when I want to put more throttle (because my speed was 10 knots below speed reference, I can't do that.
bitmaps showing AT position works well but the quandrant don't move.
And I have this same issue on landing (landing with SPD mode and pull back throttle on touchdown) and when I want to taxi out, I can't do that, A/T on.
I disconnect A/T, nothing, I must engage A/T, SPD mode and disconnect A/T for taxi out