fuzzy tool select not working

[rich2005]

(11-07-2023, 03:12 PM)RP380 Wrote: ...snip...and then  I clicked on the white space in the image, and still could not see the dancing ants that shows that it is selected. ...

As earlier post, it might be a specific bug relation to MacOS.

What you can try as checks.
Is Show Selection enabled in the View Menu ?
Enable Windows -> Dockable Dialogues -> Selection Editor to show if there is one.

   

A quick check, toggle quick mask which allows painting in selections.