I'm having trouble with it too, Gill. Try clearing your cache and cookies, then allow it to set a new cookie next time you log in. It only works the first time you use the link, then it resets, so if there are lots of new posts, use your Back button to return to the screen, rather than refreshing. If you want to catch up on the posts you may have missed, you can use the 'View posts from previous Day' feature.