>>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.
>
>I checked the table and the record was properly created. I was not able to find why this is not showing in red. I have activated a trace on your account so I can collect more information. So, when you will log back to the site, I will be able to know more about it.
>
>There is also the option in "Account\General settings\Move replies to your messages read as soon as you read them" if you wish to avoid to click on REPLIES to clear the red counters.

Changes since yesterday:

- My 4 "read" Notifications have re-appeared
- The Notification that you replied to my original message in this thread yesterday, has appeared. It was not there yesterday
- The Notification for your most recent message appeared (as expected)

So, the current state of my account now seems correct. Still, it's a mystery why my 4 "read" Notifications disappeared, then reappeared, and why the notification of your reply yesterday only appeared today.