Quote:
Originally Posted by cybmole
makes sense - calibre conversion is not replacing fl - it is replacing ( some but not all ) instances of f at start of words. ...
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It might not be that Calibre is replacing characters.
There are some PDFs that are created by scanning a book and using OCR to create a text layer while retaining the scanned image layer. When you view these in Acrobat Reader you see the scanned layer, but when you do a word search or selection, you access the "hidden" text layer.
Try saving the PDF as text from Acrobat Reader and examine the resulting file. If the f's are betas or esszetts then the fault is in the PDF and its creation.