There is always the threat of game breaking updates. That is one of the hazards of playing a game in the middle of development. That said, the devs try very hard no to break game saves and craft files. Often they will hold off, accumulating several fixes/features that will break saves in order to do all at once. The most recent update that broke saves gave the team a chance to add a few things at once that had been waiting in the wings. Once the game releases in it's final form, this won't be an issue, but for now, I would not get too attached to your saves. When it happens, take it as an opportunity to improve on your designs and missions. Cheers! Capt'n Skunky KSP Community Manager PS: I don't think 0.22 is expected to break saves.