Animate doesn't play any sound, neither of the timeline or the Library

Hello,

Animate has stopped playing any sound files. I have reviewed all the posts related to this issue here and in other videos available online and after trying everything suggested I still cant make it work: (sound file placed in 2nd keyframe of timeline, file in wav format; properties/ frame/Sync/Stream .)

I have even converted all the m4a files   again in Media Encoder to WAV.

It is strange because sound was playing on the project earlier and some hours later doesnt anymore.

I have opened previous projects and sound is not playing either when they were playing before. I have the impression something has been modified in the settings and I cant figure out... really no idea... sound in my laptop works...

Any suggestions ?

Thank you very much for your help,

Elena