Hi David,
I thought I'd posted a response here, but apparently the Shockwave crash earlier also led to the demise of my reply.....
I opened your attached file which was very helpful. In short, I think the issue has to do with the formatting of the file, and can be worked around for now.
On opening your file, I used Format/Setup, and selected Paper Size 11"x17" and "Portrait" orientation. I noticed in Layout/Page layout that there are a number of measure locks in place, and the score is "scrunched" - technical term is it has a lot of "collisions" as you can see in the screen shot:
Scrunched.png
Trying to use File/Export PDF gave the problem you described: only one page would export.
If I used Layout/Default, which removes the measure locks, the score looks much better:
Default.png
AND more importantly for this thread, using File/Export PDF for the Conductor's score results in the full file being saved as PDF.
So, we now have a new task in your honor (Task 2835) and there is a workaround for the short term.
Sorry for the bother...
ttfn,
Sherry