The first and third problem were the most prominent ones.
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The problem is the way you did your trigger, for the vision thing. What you have to do is set the trigger for Players 1-6, then do Turn on Shared Vision for Player 7. What that does is it makes P7 Vision them. That is one thing I think Blizzard worded badly. The computer filling in thing is because units are placed for a player by triggers, try making like the bunker preplaced for the players, then if it's a computer it won't show up. What you do then is make all the triggers for the players require that they own that bunker, the computer wouldn't own it because pre-placed units for humans don't place if the human isn't there. Sorry if that's worded confusingly.
Thank you. This should help a lot

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here are your answers.
1. if your using random start location then take it off or make a trigger that says if Player # has 0 anyunit. remove all units at that location and preserve trigger.
The problem is that player #
doesn't have no units.. if he did there would be no problem.
Let me rephrase this..
There are 6 human players in game.
If all six slots arnt filled, in the place of the unfilled slot will be an all-hostile computer player, creating annoying 'unit unplaceable' messages when the location is filled. I need a way to detect the computer player and remove it, or simply make it impossible for a computer player to fill that spot.