I'm not sure what this modification would have in common with the "view messages - 24 hours, 48 hours and 7 days" so I am not sure what the problem could have been. This mod doesn't affect the posts in any way actually. It simply adds some meta tags to the <head>...
Edit note: after thinking about it perhaps it was some HTML in the meta tag that was causing the problems. You would probably need to remove html formatting before inserting anything into the tags.
