It has something to do with Version 4. It occurred to me that I did an upgrade to version 4 recently. When I went back to version 3, everything went back to normal. All of the books opened to the correct page and there were no more errors on any of the books. So the cached data wasn't deleted, it just wasn't being read.
I'll probably try version 4 again after the holidays. If it still has a problem, I'll post the errors.
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