I’m late to the party but I just had the same problem and I’m sure others will in the future…
I made sure the audio icon was not X’d out on the timeline.
I made sure the “Mute” filter was off.
Finally found the problem was the audio slider under the preview window (R side, above Timeline). The numbers are in MINUS dB, so sliding the slider up toward zero brought the audio back. I have no idea how this got changed in the first place, since this is my first attempt at doing anything with audio on Shotcut.
Hope this helps.
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