macosmessagesnotifications
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?
Yes, Apple did disable Messages beta for Lion users. French blogger from Consomac found the following in the French strings of the beta:
source http://consomac.fr/news-1339-messages-pas-sur-lion.html
Although this is not the exact error that you are receiving, inevitably it will ask you to move to Mountain Lion now that it has been released. I encourage the upgrade, and if this problem recurs after you upgrade, try moving ~/Library/Preferences/com.apple.imservice.iMessage.plist to the desktop and restarting your computer. You can If this does not work, move it back and edit your question accordingly.
The source of my problem was Cydia app "Do Not Disturb".
Best Answer
Go to System Preferences > Notifications.