I was experimenting with the "Highlight Location" action of Keyboard Maestro yesterday. It worked. Today it's not working. How can I troubleshoot keyboard maestro? When I press the play button on a macro, and nothing happens, is there an internal log I can inspect maybe?
Keyboard Maestro has logs available without needing the debugger. You can find them by going to Help » Open Logs Folder as shown here:
That will open "$HOME/Library/Logs/Keyboard Maestro" which will show you two files:
You probably want the "Engine.log".
If that does not help, the debugger (as suggested already) would be a good next step.
FYI - there is also a very active forum at https://forum.keyboardmaestro.com which has a number of helpful Keyboard Maestro users, and the developer himself is often there as well.