I wanted to try again to get some advice on this issue that keeps popping up for me.
When I'm only using one monitor, the "click at found image" action is working just fine, including when set to search in the front window.
However, when I use two monitors (with the secondary monitor extending the first), the "click at found image" action fails to work when set to search in the front window, yet still works when set to search in all screens.
Why is this? Because the image being searched for is still in the front window, and in the primary monitor, so there's no reason it should stop working, as far as I can tell.