Yosemite "Notification center" "not running"

Since installing Yosemite, the notification center icon remains in the upper right hand corner of the menu bar, but when clicked it never opens, and it is not running in the Activity monitor.
Is ther a way I can turn it on?

This solved my same problem:  http://apple.stackexchange.com/questions/152064/how-do-i-re-enable-notification- center-in-yosemite-post-upgrade

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