I have a Jabra Clipper Bluetooth headset which up until today has been working fine with my laptop (Lenovo Thinkpad T420s running Windows 7).

The problem is that the audio now seems to have stopped working. I can see that the audio is playing (e.g. if I look in the volume slider I can see that the levels are going up and down as expected), and the headset is paired and connected fine. The Bluetooth headset is set as the default one in the Sounds menu in control panel. I think the mic on the headset is working as the levels go up and down if I do a test on a VoIP application (e.g. Lync).

It must be some setting somewhere that I have disabled - but I have no idea what it is. Does anyone have any ideas?