It depends on how you access the page. If you get to the page using your forward or back buttons, it will probably be a "cached" copy of the page. This usually isn't a problem, but when you are dealing with forum pages updated every minute, it will look like the new posts aren't showing up (until you hit refresh, of course, which will get the latest copy of the page). If you navigate to the thread by clicking on a link, it should be the latest version. It all depends on your browser setting, ultimately.