Why don't you check here? http://ui-programming.blogspot.com/2009/12/update-your-application-to-gwt-20.html
where you have the most important steps of upgrading a GWT application to version 2.0. (THE MOST IMPORTANT IS CLEARING THE BROWSER CACHE & USE THE URL PARAMETER gwt.codesvr) I think it will help you... Cheers!
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