I wonder if you are using a shortcut "Favorite" or "Bookmark" to access this site? OR do you go directly from the email link?
Some of my "old" bookmarks are not really current and so I do need to update them occasionally.
ALSO... I'm one OS short from being current (the GSon is coming over later to help me) and when I use Safari (for instance, on Pinterest) it tells me "You're using a browser we don't support (Safari 5). Try switching to a new browser, like Firefox or Chrome." I ALREADY KNOW THAT...DUH...but I'm not switching (and I still get to see my Pinterest)
Good luck. It might be a temporary glitch.