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Taking a look at the save file, it would seem that something was added in the save structure, which is why an error pops up and the save gets eaten. I don't think there's a fix for this due to the way that .sol files work.
That said, I think it would be wise to have two versions of the offline game, one that's up to date, and one that has up to this update so our saves can be saved.
I really should make more charts but I have finals...