As I am "painting" with the disallow foliage brush I see no changes and no indication that anything is actually happening. Also, I don't get a gray overlay like this picture from the Blizzard tutorial shows (http://us.battle.net/sc2/en/game/maps-and-mods/tutorials/terrain/). But when I regenerate, it seems like it's done what I wanted it to. Do I have some sort of glitch? I cant tell where I'm painting as I do it. I hope that made sense.
Also, how do I "re-allow" an area to have foliage after I painted it to disallow?