I'm having a weird problem with certain PDF files.
Example is "GOOGLE MAPS HACKS" from O'Reilly. It's DRM-free, purchased and downloaded from their website, then imported into CALIBRE.
If I open the file (from the Calibre library folder) in ADOBE READER, it works fine. So there's clearly nothing wrong with the PDF as it sits in the library. Windows Explorer says the file size is 13,110,462 bytes.
However, if I copy the file to my Kindle Fire HDX using Calibre's SEND TO DEVICE feature, the file won't open on the device. When I browse to the
Kindle/Internal Storage/Documents folder with Windows Explorer, it says the file size is 13,115,779 bytes, an increase of 5317 bytes over the original.
If I copy the file from the Calibre library folder to the Kindle's DOCUMENTS folder using WINDOWS EXPLORER, then it opens fine on the device, and the file size is 13,110,462 bytes as expected.
This doesn't happen with all PDF files. The majority work just fine. However, this problem is occurring with perhaps 20% of them, so it's not insignificant.
The inescapable conclusion is that CALIBRE is somehow modifying and breaking the file when it sends it to the Kindle. What is it doing, and how do I make it stop?