Back button after preview in IE

Hitting the back button after previewing a change to a wiki page results in the change going away, in IE. Steps to reproduce: 1. In XWiki, through MS Internet Explorer, Click "Edit this Page" on any page 2. Add a line at the top 3. Click Preview 4. Click the browser's Back button The line you added in step 2 is gone. This appears to be counter to the default behaviour in IE. I made a test page with a <textarea>, and IE doesn't whipe out the text when I go to another page, and then back. I added the default xwiki meta header tags, thinking that might be the culprit, but that doesn't have any affect. Any ideas? Thanks, --Craig