Canon still has a very limited selection of papers that can be used from the cassette. This will change when the new media configuration tool is released. Change the paper type to photo paper plus, now you will be able to select the cassette. if you haven't see this check it out http://www.luminous-landscape.com/reviews/...n-ipf5000.shtml
Thank you!!! In spite of reading all the reviews and creating the Canon IPF5000 Wiki, plus a couple of hours with the manual (if you want to call it that), I still couldn't figure this out. Must be pretty intuitive. Will add this to the FAQ on the Wiki.