I saw the disappearing code issue when I had my blog hosted on wordpress.com. I looked into why this might be and discovered that their Terms of Service do not allow ads. So I moved my blog to my own host & WordPress installation and I can now copy ad-sense script into a text widget and it saves and displays okay, however I just get an ad search box. Not sure if this is because my blog is very new and Google hasn’t woken up to it yet, or if I’m doing something else wrong.
