That's one of the reasons that modifying Normal para style isn't
recommended... Your modified version, is stored only in the document where
you modified it unless you check the 'Add to template' box. The 'customized'
version [having the same name as the built-in Normal] is being overridden by
the built-in Normal which takes precedence.
Although you could use 'Add to template' to update Normal style in your
Normal.dotm template that could create a number of other problems further
down the road... Most of the built-in styles are based on Normal, so those
other styles inherit from it.
Instead, it might be better to create your own custom style based on another
style or None. Define it as you wish to include the 1st line indent & use
the 'Add to template' checkbox. Then go to Word> Preferences - Edit to
select your style as the Default Paragraph Style if that's what you want to
use routinely in future documents.
HTH |:>)
Bob Jones
[MVP] Office:Mac