Sorry if I wasn't clear in the last post. AdSense Extreme is active on the site. What I did was:
- I first deactivated the other three plugins I have installed.
- Then I deactivated JetPack so that only AdSense Extreme was running. Ads were in their correct placement then.
- I reactivated JetPack. Now JetPack and AdSense Extreme are running. The ads are now back at the top with the code in the header.