Quote Originally Posted by Sarcasm1333 View Post
Having this same issue. I believe I have followed all the steps correctly but when I paint onto the layer mask absolutely nothing happens. Tried hiding the layer and mask to see if maybe it was just super subtle but there is no discernible effect at all.
I find that if I click and drag my paintbrush, very little seems to happen. However, if I put my brush in a spot and then click, or click repeatedly, I get a definite change in the appearance of the ocean. If you switch to a harder brush or higher opacity, you should see something happening (you can always undo if it's not subtle enough). Another thing you can do is to temporarily turn off the visibility of the other layers to make the changes to the ocean elevation mask more obvious.