"... grey background for screened comments.
The comment screening settings are not retroactive, which means you may need to manually screen or unscreen comments that were added before you made the changes to your account settings. Information on screening, unscreening, and deleting comments can be found at http://www.livejournal.com/support/faqbrowse.bml?faqid=15."
Does my wording make sense? Suggestions are welcome.