Actually, there is very little difference between 2003 and 2002. There
is no need to save with any kind of backward compatibility. If you are
using newer features (most of which were introduced in 2002), then those
features might not work in earlier versions (these features include
multiple masters and many animations, not hyperlinks).
There are a number of reasons that hyperlinks can break. One big one is
that you have too many hyperlinks. PowerPoint has a limit on how much
space it has to store hyperlinks. If you exceed that limit (and there is
no warning for this), hyperlinks will break in weird ways (like what you
describe).
Two solutions for this are to shorten the links and to break the
presentation into 2 or 3 interlinked smaller presentations. Because
links include path names (for external links) and slide titles (for
internal links), you could try changing slide titles to something
shorter and relinking. This is not a great solution, but it can work,
especially if you are just over the link limit.
For more details, see:
Lost hyperlinks, hyperlinks link to wrong place, hyperlinks stop working
http://www.pptfaq.com/FAQ00401.htm
--David
--
David Marcovitz
Microsoft PowerPoint MVP
Author of _Powerful PowerPoint for Educators_
http://www.PowerfulPowerPoint.com/