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Just lost over one hundred hours of game play because I suddenly can't load any of my saves.

The games comes up with a message that it can't read save data. I have seen this problem on the steam servers and people seem to have fixed it with disabeling their cloud sync and deleting their save game folder.

I however have never had the gog cloud sync on. It has been disabled from before I installed the game.
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Just encountered this same issue...