This is all in Forever Standing.
I've gotten 3 identical notifications that a single person has quoted me in a single post. I've also had no notification that I've received a new PM, despite having been sent one half an hour ago. The Messages drop-down menu doesn't work at all - nothing appears when you click on it.
In the top bar, in the More drop-down menu, there used to be several more options than there are now. One of the missing options is "Mark all forums as read", and I don't know what else there was but I definitely recall it being a longer list.