>>Along the top, "Notifications" has (4) beside it. That is the number of my read notifications. Expected: display unread notifications.
>>
>>When viewing Notifications there are 4 types that can be viewed. The type selected is supposed to be shown in bold font (as visual confirmation of what you're viewing). That is functioning correctly only for the first 2 types.
>
>What is the reference in regards to the 4 types that cannot be viewed? Basically, in what list and what is expected to be adjusted?

Hmm... I now no longer have 4 read messages, so there is no "(4)" next to Notifications any longer. I didn't delete any of the notifications that were in that list, they seem to have disappeared by themselves.

The font bolding is now working as expected.

One thing that is different at this time:

Previously, when someone replied to one of my messages I would see "Replies (1)" and "Notifications (1)". To clear them I would have to go into both and delete the entries in the list.

At this time I have "Replies (1)" but no Notification that you replied to me.

I'll log out of UT and log back in, see if that makes a difference.

UPDATE: logged out of UT, closed and re-opened Firefox 51.0.1, no difference. I never received a notification that you replied to my original message in this thread.