I don't use installation tilesets, so I have no idea how the trigger that opens and closes doors works. What actions open and close the door?
I believe that enable makes the door go up and disable makes it go down.
Put a location on the doors! Enable doodad at location, Disable doodad in location! Enable makes it go up and disable down, i think, crap or vice versa at least!
make sure its a nuetral player for doors
Players can own doors, too. Just disable doodad state for door owned by all players.
Disable means you can walk through it. For remembering, I always think of it as enabling it makes it able to achieve its purpose of stopping people.
Place a door (for any player, preferably a neutral one), put a location around it.
Enable doodad state:
enable (closes)/disable (opens) doodad state for (door) at (Location) for (player, use All Players, 'cause it applies to the door no matter who it's owned by).
For a door that opens when you walk up and closes when you walk away, try brings at least 1 unit, disable state, then another trigger that says brings at most 0, enable state.
You can also use the doodad state to make a protoss building that doesn't need a pylon, but it's very unreliable.
Why is it unreliable? You just need to re-enable it when a unit is created or killed.