I don't think I'm letting Apple off easy because I don't think it's not their fault. I just think that, until we see the document in question, we can't squarely

I don't think I'm letting Apple off easy because I don't think it's not their fault. I just think that, until we see the document in question, we can't squarely say that it is their fault. Preview and Acrobat both have ways of dealing with junk/bogus data and I feel like that's what's going on here. There must have been some kind of bit switched when the document was "corrected" and it's possible that Acrobat and Preview just resolve that issue differently while both still outputting "valid" PDF files.