I am trying to use the eraser on a hidden layer, but photoshop is not allowing me to do this. I seem to remember that I have done this in the past. I need the layer to be invisible to work on. Can anybody tell me how I need to alter the settings to be able to edit an invisible/hidden layer?
Show the layer you want to "hide"
Option click on the mask symbol to place a mask filled with solid black on that layer
It is now "hidden"
Paint in white on the mask to reveal (un-hide) areas in your "hidden" layer