How do I fix Notification Centre? It is blank in "Recents" mode Within the last two weeks, the right tab in Notification Centre ("Notifications)" became completely blank, without warning, and with no apparent trigger. The sort order mode is "Recents".

How can this be fixed?

I have tried to restart the Macbook in question, and Notification Centre itself using Activity Monitor.

(Mac OS X Version 10.11.6 (15G31))
A workaround: change the sort order to "Recents by App" in the Notifications section of System Preferences.