If you cannot log into admin control panel, take a look at the url. Are you using the url with www or not? In Mys v1.3.2 your url must include www, in earlier versions this is not a requirement but you must be consistent. If you log into
www.yoursite.com, your admincp must be something like
www.yoursite.com/admincp. The reason is that the cookies for www and non www domains are handled differently, the script cant tell yoursite.com and
www.yoursite.com are the same site.