Possible Questions/FAQ:
Q: I can't break or place blocks
A: Press F6 until you can, it's a bit finicky so keep trying.
Q: Animals are on the map, how can I remove them?
A: Using SP Commands you can type "killnpc" which will kill all mobs within a certain radius, if you're on the Dev Map the animals will despawn eventually.
Q: Why do all connected fences break when I just break one?
A: This is a code thing, it's how debris blockades are handled, be careful with how you place fences on your map.
Q: I saved and quit on my map but when I loaded back in my changes were reset?
A: You MUST save the map properly, check the front page or my mapping tutorial for how to properly save your map.
Q: When my zombies spawn sometimes they get stuck in the wall?
A: You should leave at least one space all around your zombie spawners if possible to make sure they don't spawn incorrectly.