Thank you for your post.
This is a the function with the browser and not FileMaker. Even with this forum, enter information into a reply but do not post, if you press the back button with IE8, and then move forward again, your entry is gone. However, with Safari, you are able to go back and come forward again and see your entry. I know this is not the same, but If I log out of this forum and press the back button, I see the previous information in Safari, but not with IE8.