Prior to the recent "read-only" mode related to the data center migration, someone commented on an answer of mine. I did not visit that site prior to the maintenance period, so I never cleared the notification.
When the site came out of read-only mode, I noticed that the inbox notification, which I click and the notification disappeared.
But when I go to another page (or reload the current page), the notification comes back.
Ok, here it is:
Good it's gone
Ack, it came back (again and again and again)
Given the notifications that have come from this question, it might be the top bar that is busted. I did not see any reputation notifications at all and the inbox nofitications still displays
(1) despite that fact that this question (as of this writing) has 2 comments.
And now the issue with the top-bar (rep notification and the ever present inbox notification appears to be gone. Given the timing, it may have been related to the migration (either directly or indirectly).