Right. I just had to do something very weird:
Click 'quote +' next to all the ones I wanted. When I hit 'reply', saw no quotes. Then posted, to see if they just magically went up. They didn't.
So came out of thread, went back in. So then hit 'quote' (without +) on my own message, and suddenly I've got all the quotes I'd originally chosen in the box.
Sorry, I'm going to come out of this thread and try again on another thread, so I'm not using my own message to confuse myself...
I'm on an IMac by the way...Safari.