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I think something's wrong with my Hammer. Whenever I try to do any sort of trigger, when I check my map for problems, it always says "Entity (<trigger name>) has bad I/O connections." No matter what I do, whatever I try, none of my triggers do anything.
I even tried the simplest trigger I could think of: By walking into a trigger_once, you ignite a citizen named "npc". But even that doesn't work. Someone help me ;(