Ive had this problem on both Blogger.com and in Frontpage.
I insert adsense code into my page, it works fine.
Then I insert a second ad and it doesnt show up! Only the first ad shows, I've tried pasting it directly into notepad, into the HTML editor mode of frontpage. I open it up in Internet explorer and only one of the adsense blocks shows up the other one is just a blank space, however if i click on it i can click properties and it has the "googlesyndication" link in it.Is it something to do with frontpage messing around with the code? I put it into web compononent/advanced/html so I dont think frontpage touches it...
On blogger for some reason it doesnt let me have adsense in both the sidebar and the main posting section, the code pastes in and nothing at all shows up.
This is driving me crazy I dont know what the problem is, Im sure its something simple though.