The browser back button clears all fields in a multi-page wizard. Tested in Firefox 3.6 and Chrome.

To reproduce:
1. Go to http://demo.liftweb.net/wiz2
2. Enter "hello" in the text field and click next
3. Click the browser back button
Actual result: the text field is empty
Expected result: the text field is populated with "hello"

See mailing list thread started Nov 22 2011 titled "Back button clears form fields in wizard and plain forms", http://groups.google.com/group/liftweb/browse_thread/thread/5dcd7fc84c144ebe/782cc7d4e242ffab?show_docid=782cc7d4e242ffab