Notification Center Bugs
On the Mac, I cannot prevent Calendar from notifying me with an alert for each event. I keep turning off its notifications in System Preferences, and they keep turning themselves back on. This seems to be a longstanding bug that others are also seeing. I’ve tried remedies such as deleting its database, but nothing has helped.
On iOS, sometimes Notification Center will not appear when I swipe down from the top of the screen. This happens both in apps and on the lock screen. The lock screen even shows the grippy strip, but it won’t budge.