Howdy. Brand new to the forum but was having this same issue and could not figure it out. After reading thru things here I again double checked my settings, despite the fact I had never changed them and the problem just mysteriously started a couple of days ago. However, one thing that I did do was update my GoSMS app which automatically switched a setting. Here is what worked for me....Open GOSMS, then menu, settings, notification settings, default notification settings, select ringtone, set it to "Default". Mine had been switched back to "Current" but once I changed it...voila...everything was back to normal. Before I switched this when I did the "test notification" thing, it showed the right settings but no sound. Afterwards, test notification worked perfectly. Hope this works for you.