No more notification for iMessage with Mavericks I did the upgrade to Mavericks few days ago. I noticed a problem with my iMessage app : I don't get any notification when I received a new message (neither alert, nor badges on the icon in the Dock). 

How can I troubleshoot if this is a problem with my computer or account or perhaps my network connection?
Go to System Preferences > Notifications.


Make sure that you're not in the 'Do not disturb" mode.
Check your settings for the Messages app. Enable 'Banners' if they're off (or even 'Alerts').