CS4 is adding a blank page, throwing off the printing

Question

I am creating a 40-page booklet to be printed 2-up saddle-stitch
In the Pages layout, it says i have 40 pages in 21 spreads. 1 page on the top is the front cover and 1 page on the bottom is the back cover and 19 double-page spreads inbetween. Pages 2 and 39 are the respective inside covers. Page 1 is aligned on the right and page 40 is aligned on the left. It should be printing fine, I would think.
But in the Print Booklet-Preview Pane, it gives a message that it has added 1 blank page to creat the booklet, and it was added before page one, so I now have no back cover, and my inside covers and page layouts are all wonky now.
I noticed that in the Pages flyout there is a small square to the right of Page 40, where page 41 would be. A small square that I can't highlight.
A few more items of interest, all pages have both Allow Document Pages to Shuffle and Allow Selected Spreads to Shuffle checked.
I am at a total loss. Any help would be greatly appreciated.
gw

Answer 1

Keep in mind that everyone here is a volunteer. Most of the regulars, like myself, drop in at least once a day, as we have time, and offer advice and solutions when we have them.
That said, I saw your post when it first was listed, and saw that you seemed to finding your way, and didn't have anything more to add at that point, as I suspect was the case with a lot of others. I'm sorry it never occurred to me to ask if you had any blank pages in the document, but there was nothing in the original post to suggest that, and including blank pages in a booklet print job is a pretty standard thing to do. If you know enough to have already added blanks to fix the page count, one would presume you also know enough to include them in the print job.
As far as the forum organization, we're about to go into a new version of the forum software, and many of the regulars are looking on that with some trepidation. Most of us actually LIKE the way things are now -- functional and uncluttered with extraneous nonsense like avatars and ratings points -- but it seems much of that is going to be creeping in. An attempt to unify the Adobe and Macromedia forums last year was an utter disaster, and we've all got our fingers crossed it won't happen again, but we'll be living with it no matter what as the Webcrossing contract is up and Adobe has signed on with Jive. You might want to take another look when the changeover is complete.
And, I'll repeat, these forums are probably the BEST source of FREE and accurate expert information on Adobe applications on the planet. You'll find users (and even some Adobe employees) from all over the world with vast experience in some pretty esoteric and specialized techniques. I find I still learn something new almost every week, and I've been making my living with InDesign since version 2.0 was released. I hope you'll come back if you have more questions.
Peter