I'm working on two books of 700 pages each that were originally built in Quark 5.5 and now converting them to 6.1 for Mac. I was told that I need to rebuild these 60+ chapter files from scratch because every couple years Quark files suddenly become corrupt, and these files have already been used for a few years. Is there any truth to this? I have never heard of corruption happening to Quark files on such a large scale before, and rebuilding these docs will take a lot of work. Thanks so much in advance for any insight.