If you have a problem where Quark jobs are being dropped on a Fiery RIP - but all other programs are working fine, then you need to update your CUPS/Fiery driver.

Quark's official info is here:

http://www.quark.com/service/forums/viewtopic.php?t=17626

But if you want a shortcut to the fix, just install this:

http://www.techsuperpowers.com/downloads/CUPS_Installer.sit

This fix helped one of our best clients - the Boston Celtics - to get printing working from Quark again for one of their printers.