The Hover text functionality is not part of the product in version 2006. In order to make it work, I had to download some code from the web and add it to the end of the stylesheet.jsp (requestcenter.war/refactor/common/css)
I've enclosed a image of how it behaves in version 2006
It would be helpful if you posed which release of the Browser you are using with each of the versions of RequestCenter. The Hover element behavior appears to be dependent in part on which release of Internet Explorer you are using.