How dumb can a person feel?
Can I claim a "DUH" moment?

Repeat after me a kazillion times....

Radio, Radio, Radio. NOT checkbox, NOT checkbox, NOT checkbox.

Our initial reason for using checkbox is that we have a couple products which have 2 or more pdf associated with the product.
More reason for me to redo things.

Things appear to work when I use the proper setup. Says he with egg completely covering face.