No slide show sound on Photoshop Elements 15

Hi,

I have no sound when I play my slide shows in Photoshop Elements 15.

I used the off the shelf audio tracks provided in Elements 15.

Yesterday the slide shows played with sound.  Today they don't.

However I can play Pandora music and MP3 audios with sound just fine.

Is there a sound setting in Elements 15 that turns off the audio?

Or Elements sending the slide show sound to a disabled headset or laptop speakers and I have to select the working headset in Elements 15?

Thank you.

Neil