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You see, the editor is such that it's easy to mess things up. I tried to figure it out, but I couldn't. But for now, I've formed the opinion that a lot depends on chance (maybe it's not chance, of course, but it's impossible to give a normal logical explanation for these effects). My attempts to simply create a new campaign in the list, even if it only worked somehow, resulted in 5 campaigns appearing in the list, and only one of them worked... But at the same time, each time I acted absolutely the same way, only the names of these creations were different. So, I don't think that guy is that much to blame.