I downloaded recently (I mean just 2/3 days back..). Yeah I might agree it is bcoz of security issue. But i'm not sure to check which security configuration to check bcoz i've reset the user profile and re-added the users in group.
So I went on a work around for now: Edited the search result XSL to Redirect to a filtered view where the user will find only the particular document to rate from there. I know its round trip for user but as of now i cudn't figure out any near solution.
However, I'm using this in a 64 bit MOSS on a 64bit Windows server 2008. I suspect some security feature of Windows 2008 might cause this or not.. donno.. just a guess.