very simple is because your battery died it corrupted your saved game so use the save you had prior to the last one so you go back before the point you were last at and it should be fine after that. its not the game its the saved game thats messed up
as others have said its best to update to v1.5 so buy the gold edition of the game and it comes witgh the ad-on since just buying the ad-on will cost about the same as buying the gold edition version for around $10
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