Audio demo component of jucedemo misbehaving?

When I play a .wav file, I’m supposed to see a waveform display in the bottommost widget, right? Doesn’t seem to work in 1.43 and the earlier version I have. My problem, or known issue with the demo?

No, it’s not a waveform of the file you’re playing - it’s showing the live audio coming into one of your inputs.