I've got a stuck notification badge (showing 1 message) on Messages on my new MBP. Interestingly, my old MBP (which I'm still using on the side for some things that I haven't set up yet) also has a stuck notification.
My iPhone and iPad don't show the notification, and they are all linked.
I've tried all sorts of things....
1) Turn off notifications and restart
2) Kill dock via terminal
3) Force quit notifications in activity monitor
4) Sign out of iMessages
Any other thoughts?