Working with layer masks, when trying to go back and add to them I am unable to select the mask. The work around is to go into channels with the layer selected and turning on the layer mask there.
Here is the layer palette. You can see the selected layer is highlighted. Except that is not what I wanted to highlight. I want the layer mask. No amount of clicking, exiting, or restarting seems to fix it. I have to go to the channels palette and select it that way (which works but is at best clumsy)