Text before details quiz results is shown based on a text template. It seems you haven't selected a text template in quiz settings. Open quiz settings page and check "Results settings -> Successful template" and "Results settings -> Failed template" parameters. Text templates can be created on "ARI Quiz -> Text Templates" page.
About "The answer is correct" and "The answer is incorrect" messages. It seems this a problem with language INI files which where translated by yourself. Could you send them by
email?
Regards,
ARI Soft