Shadow is right, though. Once you enable a building, it will stay enabled until another building for that player is created, killed, or given (maybe moved too). That trigger also enables one and only one unit (the top-left-most one) in the location. All of this was covered in the later part of the tutorial (the part written by me

).
[right][snapback]283069[/snapback][/right]
I read some tutorials yesterday and in the "grid tutorial" it was said that (the bottom-left-most one) not (the top-left-most one) is first. Which one is right?