So, my pot bunkers aren't lowering when I hit the lower button.
I have the library settings displayed here - the thing that is driving me nuts is that I have literally copied all these numbers from another course where the pot bunkers are working flawlessly.
As you can see, the lower terrain button is depressed (highlighted in red).
I've noticed in some tutorials and examples that the "N" button below "Pot" next to the "F" is toggled on; I've done it both ways and it hasn't made any difference.