Printing a 3 page pdf on duplex page 2 is blank

As you mentioned, I too found the issue of a blank page printing on the back of page 1 only occurs if the document has an odd number of pages. I realized it was a result of a conflict between Acrobat and the page order that the printer driver automatically prints in.

To resolve the issue,

1. Open the Acrobat print window.
2. In the "Pages to Print" section of the Acrobat Print window, open "More Options" and select "Reverse Pages".
3. Open the "Printer..." settings and select duplex (Two-sided) printing. Select Print
4. Select Print

Now your document should print correctly with the blank page being on the back of the last odd numbered page in the document.