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Although I see an option in System Preferences > Notifications to enable applications to pop a sound on new notifications, Mountain Lion is not actually playing those sounds.

Has Anyone run into similar problem?

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Many notifications don't have sound effects. Have you tried for example adding a reminder at – user495470 Aug 8 '12 at 21:37
Thanks for answering. I've just tested the Reminder Notification: no sounds at all, even tough Notification Settings for Reminder app has all the three features enabled (notification, badge and sound). Any other idea? – Alvaro Lourenço Aug 9 '12 at 18:32
Sorry my terrible einglish. I have same problem exactly. The sounds of some notifications of some programs of the center of notifications do not work (Capucin, Tweetbot), however others works o.k. (mail,mensajes). I think that many applications even aren'y ready to work with the center of notifications especially the sound the sound. – user27476 Aug 15 '12 at 19:11

I upgraded my mother's new iMac to Mountain Lion and noticed that the mail sending and receiving sounds were not occurring. I found the following URL which was a temporary fix, but the problem comes back... so I think there's a bug here.

You might try the following to see if this helps:


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