Originally Posted by anamardoll
Just for the sake of clarity:
The Calibre PDF-to-ePub converter is so rudimentary that the Calibre User Guide practically advises the user not to bother. Not in so many words, of course, but...
Very true. Conversion of fixed layout to free layout is always going to be trouble. At least the option gives you a shot at generating a file with a format more ideal for an e-reader.