It is a big ask of any programme to export a 50 page doc. as PDF. Look how Adobe AI handles it up to CS3 you can only open 1 page at a time and the files are so large for print when saving them as a PDF. As Steve has stated there are easy ways around the problem and it just requires a bit of planing and the problem is solved. Most folk use Acro to assemble their PDF's for printing it is what the programme was built for.
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