Sound output not working anymore

Hi,
I've been working with Sound Ouput palettes since a few weeks and everything was working well, but now something happened and I can't hear no sound coming from my VIs.
This problem occurs even if I try to play LabVIEW examples such as "Generate Sound". Speakers work correctly, infact other programs such as windows media player are able to play sounds.
I have Windows 7 and LabVIEW 2013... Does anyone know which could be the problem??
 

 
may be device selection changed.
Try with the below Express VI which is avilable in Sound VIs.

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