I saw that this was noted in a topic below, but I've not been receiving notifications for certain replies. This doesn't happen with quoted (usually, I've seen one instance where I wasn't), but only when the reply button is used. I've come upon replies sometime days or weeks late that didn't alert me. Quotes seem to be the only way it works.
Also, the notifications have changed. They are now much larger and now I'm unable to view more than four or five notifications at once when hovering my mouse cursor over the bell before they reach the bottom of the screen. If I try to use my mouse wheel to scroll down to see more, it moves the background of the forum down and not the notifications that overlay it. So I can't view any more notifications other than those five.