Just an update. When I wrote on 2020/12/20 that the problem is fixed in 3.4.0 on Win10 I spoke too soon. In my one session experimenting with it right after installing 3.4.0 it worked, but then since then it behaves the same as 3.2.1, i.e., it randomly works and doesn’t work. Maybe this is just a problem on Windows and not Linux and Mac?
The color zones module has a way to target particular areas by using the eye dropper and then a vertical black line appears on the color graph (which looks similar to the tone graph in the tone equalizer). So far the color zones method seems to work every time.
I really like the tone equalizer method, but sometimes it is difficult to get it to work. Sometimes changing one of the nodes will then cause the mouse cursor to change, but not always. I can’t quite narrow it down to a sequence of events where it won’t work, but it often seems to be when I have been in tone equalizer, the mouse cursor worked properly, then I did something else in a different module, returned to the tone equalizer, and now the mouse cursor doesn’t work. Or sometimes when I turned off the tone equalizer and then later turned it back on and now the mouse cursor no longer works.