I had to put a call in to IBM and it turns out that the one Group that we had the users assigned to was corrupt. We added a couple users to the ACL explicitly and they were able to open the printable window just fine. So, after adding them to a new Group document, we removed them as listed explicitly and now they can still get to the page without another signin prompt.
Never would have guessed that.
Thank you all for taking the time to chime in.