It's probably not a conflict with security settings, but the website you are translating may actually be detected as a problem site. The page may have been repaired by the owners, which should remove the warning.
Here's a forum link that may be useful: http://productforums.google.com/forum/#!topic/websearch/JXVDQ4J2Amk -- You received this message because you are subscribed to the Google Groups "General" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-translate-general/-/n_y4cYijWHYJ. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-translate-general?hl=en.
