I'm not sure I understand what you are looking for when you
say the settings are overwritten. But if you mean that a CPTL file
has different defaults when it is opened on another machine, I
believe the settings are intended for a specific machine. This is
done on purpose, so that a file from someone else's PC doesn't
change all the carefully selected defaults on a different computer
system.
If you want others to use the same caption styles, fonts,
highlight box settings and so on, it might be best to create a
"library" movie (leave it a *.CP instead of a CPTL) with those
objects all gathered on the first slide or two, and distribute that
movie to others in your department or firm.
The "library movie" can then be opened in its own instance of
Captivate, while the project movie is being worked on in a 2nd
instance, allowing your developers to cut and paste objects as
needed from one movie to the other.
Does that answer your question??
HTH.