Can’t click/drag MacOS notifications, which are transparent, have to restart Notification Centre I have this problem on macOS Mojave (10.14.3, but it happened on older versions too)

Notifications are transparent and non-responsive to click/drag anything.

See screenshot: 



If I kill NotificationCentre process it disappears or become "top-positioned" element on display so I can drag / click it like I normally would.

This usually happens if I disconnect my external display or wake from sleep.

Thanks for help!
The only fix officially is to kill the notification center in Terminal with

killall NotificationCenter


This may become inconvenient if you need to do it too often though.