I've missed the 'a new post has been made' message a few times recently - not because it doesn't show up, but because the new page loads with the view at the top of the page - meaning that I see the Shoutbox, the banner, the tabs, and the Home-Help-Search menus. The red message is still a bit of scrolling below that. If I hit Post, and then go to check my new replies (not seeing the warning), then bye-bye post.