Thank you for your post.
You must click "Post Answer" to save your post. After that, you can click the back arrow.
If you accidentally click the back arrow and press the forward arrow again, I noticed that the post is still active using either Safari or Firefox on Mac OS X, but fails when using either Internet Explorer 9 or Firefox on Windows XP.
If you are running under Mac OS X, let me know, and we can compare settings.