a.k
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It’s strange; this “glitch” was fixed more than a year ago in one of the first patches. You can read about this bug somewhere here: /topic/8608/, but I think there is only one solution – replay the game from scratch, although… you should have the last 10 standard saves left; open one before the plague week begins and this bug appears, and update the patches to version 1.3 beforehand; I don't think this bug existed in that version anymore.