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Reboot on safe mode and check again
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
That's odd, you could repair your phone with PCC
Bridge (for Mac)
Alternatives on How to backup Xperias
In other words you don't want the notification sound to be connected to the notification on the "notification bar"?
I don't understand the issue, just check the notification option on the messaging app