My thesaurus

[Raven]

Half way through my document my thesaurus would not provide synonyms for
words, yet if I were to move up the page to another word above a certain
point it will provide synonyms?

 

[Bob I]

Just a thought but did you disable it for that section? Or perhaps the
Language got set to something other than English. Look in Tools,
Language. I would select all in the Doc and then Set it correctly in
language.