Try going to Settings > Safari, and Clear Data and Cookies. This will get rid of any legacy data from the older version of Safari, and might clear up your problem. You will have to sign back into all the sites that usually remember you, since that data is stored in Cookies.
While you are there, make sure you don't have Private Browsing turned on and that you Accept Cookies from visited sites. No cookies or Private browsing will keep sites from remembering you.