Masks no longer appear in Photoshop CS6

[sambanyc]

I have been using Photoshop CS6 for years using Masks with no problem.  Starting yesterday, there is no longer a "frame" around my image, in the panel on the right  when I open my image in Photoshop-- the frame is what I click on to activate the mask.  I can no longer find any way to use Masks.  Please help! (I am working on a Mac desktop.)

[Barbara Ash]

Try resetting Photoshop preferences. Preferences in Photoshop  scroll down to Reset Photoshop Preferences