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Installed the game, started playing, and encountered a problem on the second mission. I'm trying to replace regular units with green ones, and sometimes it works, but sometimes it doesn't. I don't understand what's going on. Version 3.1, running the game using your EXE file. It's not a major issue, as I can complete the map with regular units, but it's still a bit strange. What's the reason for this? What am I doing wrong?