Yes, that is exactly what I am trying for. I was able to recreate your success by exporting to PDF directly in Scribus. All the other methods I was using somehow involved the Print Driver. I will have to experiment some more to see what the issue is, exactly.
The most important thing is I have a solution to move forward. Thank you.
For other projects, I've used the booklet printing function in Adobe Reader and an open-source, Java app called Bookbinder
from Quantum Elephant. Bookbinder is great for large PDFs. It imposes them into signatures and saves each as a separate pdf. Then print each signature. I do want to explore the links you have given as well.
Again, thank you for the help.