I use the latest post function exclusively and noticed that the back button works fine if I do not go into a
thread. Once I go into a post the back button fails. Just an observation but once in a post the popup advertising starts in the margins and after some of the posts. When I hit the back button the advertising refreshes, if I hit the back button quickly several times each on of the popups attempt to reload. Give all this it appears that the pages where advertising is loading is the root cause of the problem. Pages without advertising have no failures when the back button is used.