Hi Carl,
Go to Edit> Preferences> Spelling & Grammar. Make sure Custom Dictionary is
set to the correct dictionary (usually Custom Dictionary). Then click on
the Dictionaries button and make sure the language is set to None. This is
the preferred setting unless you are regularly using multiple languages and
really need to have separate custom dictionaries. If that's the case, post
back.
Also, check the Word Help under "Troubleshooting Spelling & Grammar".