I am trying to compare two fairly similar documents using the
  Tools --> Track Changes --> Compare Documents   feature,
but when I do this, Word compares the first 5.5 pages or so and
ignores the remaining 22 pages.  There seems to be nothing special
about the point where it stops comparing the two documents, other
than it is at the end of a paragraph -- in one paragraph, all the
changes are highlighted, and in the next, none are.

I've tried doing this in Word for X running Jaguar, and I also tried it
using Word 2001 for Mac OS 9.1, and I got the exact same result -- it
stopped comparing documents in exactly the same place.

Any ideas on why this might be, and what I might be able to do to fix
this problem?  (I guess I can always split up the file into multiple
shorter files, but I'd prefer a real solution.)

Thanks,
Aron