Your screenshot clearly shows you have
two default devices:
one is your headset (default device),
another one is your bluetooth (default communication device). I believe that's where OS gets confused.
- Select your Bluetooth device;
- Click on drop-down button next to "Set Default" and select "Default Device"
- Then select your Headset;
- Again, click on drop-down button next to "Set Default" and select "Default Device"
At this point your headset should work. If you want your Bluetooth to become default sound output device, then repeat steps 1-2.
Try this article as well:
http://www.consumingexperience.com/2009/04/failed-to-play-test-tone-no-sound-on.html