iMessage stuck in Notification Center I have this weird situation where I was using the reply-from-Notification-Center Messages feature and it got stuck in the write-the-message state, as in the screenshot below.

 

The message was sent, but ever since it got stuck and it’s unusable.

How can I reset it without restarting the computer or logging out?

(I’m on Mavericks.)
I was able to fix this by killing Notification Center with the following command:

killall NotificationCenter


You could also force-quit it from Activity Monitor.

Source.