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Various character pairs like 'ff', 'll', etc are missing from my conversion This is probably caused by the PDF containing what are called ligatures. These occur when the publisher changes certain pairs of characters into a single character to make the text 'look better'. Common are 'll', 'fl', 'fi', 'ff', 'ffl', and 'ffi'. Unfortunately, due to a bug in the third party library Calibre uses, in many cases ligatures simply aren't supported. Several users have reported having good luck with Mobipocket Creator or Acrobat Professional for these types of files. Other users have suggested using the 'PDF Print' features provided by various plugins & operating systems. Print the PDF to a new PDF, and then convert the new PDF in Calibre.
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