Check the following chapter file's pagination settings. My guess is that it's forced to start on a particular page, and the previous file has no choice but to add a blank page to make the pagination flow properly. Set the following chapter's pagination to "Next Available" if you don't care whether the chapter starts on the left or right page.
-- Bill Swallow HATT List Owner WWP-Users List Owner Senior Member STC, TechValley Chapter STC Single-Sourcing SIG Manager http://techcommdood.blogspot.com avid homebrewer and proud beer snob "I see your OOO message and raise you a clue."