I have upgraded to the RC2 release and I am still having the problem where when you hover over a URL, it is not highlighted and thus you cannot click on it to open a browser window. If I want to visit a link in an email, I need to select the URL text, click copy and paste the url into the browser.
I have restarted prism and rebooted the whole box as well to no avail. I have always had this issue throughout all the versions. I use Ubuntu Linux 8.10.