It seems that about half the sites I visit I get the following messege when I hit the browsers "back" tab. What's going on??

Warning: Page has Expired The page you requested was created using information you submitted in a form. This page is no longer available. As a security precaution, Internet Explorer does not automatically resubmit your information for you.

To resubmit your information and view this Web page, click the Refresh button.

I have the same thing happening to me. I`m curious as to why.

Usually if you hit the refresh button on the page that says the Warning: blah blah blah, then it will work. It happens usually because you are sending a form or searching for something.

It usually happens to me on traderonline too. I have started holding down the shift key to open an new browser window when clicking on a link. That keeps my original search window open as well. I'm not sure why this has started happenning, but may have something to do with IE6.

Wait a few minutes and hit the F5 key.

You g=et that message because the previous page was a form that required specific information before going to the next step. Like Trader Online. There you had to put in the make of boat, length, key words, geographic area to search, etc.
If you do any online banking or bill paying you'll get the same message trying to go back a page. In this case it would be a security measure.
By hitting refresh, the site will pull from your temp files the necessary information to reopen that page.

Hope this helps.

what version is your browser? Go to Help, then about internet explorer and see what version you are running.