Thanks, but I am confused as to how I could have done that. I had done some find and replace (in text files) changing some css blocks into another. And some of the times I saved it as a copy to another file as a backup it worked fine. Then suddenly, even though calibre was able to keep working on it, it was unrecoverable.
I'm trying to figure out not just how to fix it (if possible) but how I might have done that, as this is basically the third time through the book that it has happened, and I just do not want to do any more work on it until I can make sure I do not repeat it again.
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