Advanced Mode doesn't work Rated 3 out of 5 stars

I use SeaMonkey 2.4.1 on Windows Vista with Internet Explorer 9 installed. The Classic Mode works, but the Advanced Mode which allows Adblock Plus and Sync Cookies does not work. Ad blocking, Ghostery, and many other privacy add-ons are supported in Internet Explorer. I prefer SeaMonkey, but occasionally use Internet Explorer for certain sites--especially Microsoft sites.