Ok, yeah. It is because sometimes on MACs when you set them invincible they become Player 255. Also I had tried triggers setting the players in them to 255 and it doesn't work. Only use is for effects, because when you click them they usually have a green circle like they are your own, but they are enemy.
And I think every mac can do this. (Macs have the coolest StarEdit glitches

)
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ONLY StarFire. I was using the regular edit for about 3 years and hadnt gotten that.