analyse/contrast tool stopped working

I have been using “analyse/contrast” for awhile and it worked fine. Earlier today I used it. Now the contrast function doesn’t work. “Plot Spectrum” and “Show clipping” work but clicking on “Contrast” does nothing. I select part or all of a track as before, but now it won’t even open the contrast window.

Without stooping to Help-Desk-Speak too much, when was the last time you restarted your machine?

What is your Windows version and which Audacity do you use? Current version is 2.1.2 available here:


I’m using 2.1.0 but will update immediately. Turning off the computer and turning it back on solved the problem. This was a weird glitch because it only affected one of my Audacity projects. The others were not affected.
Thanks for your help.