What I realised is, as Daniel said, that gradual dynamics don’t seem to update automatically. When I type a crescendo and add a ff at it’s end, the crescendo won’t play back. If I delete the crescendo a place it again now, it won’t change either. But when I delete the ff, add the crescendo and then the ff again, it will work! Maybe that’s gonna help.
What I also realised is, that when a crescendo starts or ends on a time/note, on which I already placed a dynamic, the crescendo just won’t work. Starting the crescendo a bit later will do it.
But I agree, that some times dynamics won’t play at all, until you restart Dorico. I am still trying to figure out, when this happens.