Hi C. Staig,
the first thing I could imagine is that you don't have write rights to the destination you are exporting.
If that's not it, then an update (free of charge) to QuarkXPress 7.5 might help.
If this doesn't solve it, I'll connect you to Tech Support.
Regards
Matthias
Matthias Günther
Senior Product Manager
Quark Software Inc.(Please note: As I am traveling and do not have access to the forums, I will not be able to respond to forum posts currently.)
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