On my main Mac I have to select a layer in the layer palette before I can work on it, if I click on an object in a different layer in the main window it doesn't change my layer selection in the layer palette nor does it select that object in the main window.
However I was working on my other Mac today and noticed that clicking on objects in the main window changed the layer selection.
I can't see the option that changes this behaviour, can someone point me to it.