Suddenly I can't hear playback at all?

Totally updated macOS and AudacityOS. Yesterday I could hit playback and hear everything normally. This morning I can’t. I’ve restarted my computer and Audacity and nothing is working.

Check your Playback Device, especially if you have a USB mic or some additional audio device plugged-in.

I already tried that. Also none of my settings had changed from the day before anyway. Suddenly I just can’t hear anything.

With the output volume control integrated into the output level meter it is easy to accidentally set the playback volume to zero.

YES! This was it! Thank you!!