I've a site that I have WP 3.5 on. For some reason the new WP 3.5 interface doesn't show up -- the old interface still shows up. (e.g. when I click the add media button the old 3.1 interface style shows.)
I've disabled all plugins, switched the theme to 2012 and still can't get the new interface.
I've checked a couple of other wp installs that I have and they seem to be working fine with the new 3.5 media manager interface.
Any ideas what might be causing this?