I can't reproduce this using Windows XP. I can save a PDF and get two pages. Have you modified this layout in any way? What do you get when you enter preview mode? Can you click the book control and see multiple pages?
If all else fails, try recovering the file and test the recovered copy to see if it has the same issue.
Things to keep in mind about Recover:
While Recover almost always detects and fully corrects any problems with your file...
- The recovered copy may behave differently even if recover reports "no problems found".
- Recover does not detect all problems
- Recover doesn't always fix all problems correctly
- Best Practice is to never put a recovered copy back into regular use or development. Instead, replace the damaged file with an undamaged back up copy if this is at all possible. You may have to save a clone of the back up copy and import all data from your recovered copy to get a working copy with the most up to date information possible.