Yep, I'm using version 575 which I'm pretty sure is right. I use a similar saving system to what you describe, I don't overwrite any saves and I keep all of them until the end of a patrol and then make a save while I'm in the office. I also only save surfaced when my boat is by itself.
It seems to always break at the same point in the campaign, all the saves before the transfer are good, and after it they all corrupt, no matter what I do. A very annoying problem, I might just have to skip the 1st few months to get past it, although it's strange no one else seems to have had the same problem.
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