If your Mac is mysteriously no longer showing notifications, restarting your Mac will most likely fix the problem. However, here’s a quick way to remedy the situation without restarting.
I recently updated my MacBook Pro to the latest version of macOS High Sierra, but after the update, I was no longer receiving any notifications. I could’ve rebooted my machine to fix it, but I already had a ton of tabs and other applications running and I didn’t want to shut all that down. Instead, I just used the built-in macOS utility Activity Monitor.
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