Blank ads appearing on site

Hello,

I just installed the Adsense Manager plugin. I’ve finally managed to text wrap around my ads in my posts, however now blank ads are showing up in the positions where ads are supposed to show up. You can see this at http://www.take-20.com

Any suggestions on why this is happening? When I go to my individual posts I’m not having this problem. Is there something wrong with the code perhaps? I’m using a section targeting plugin.

Thanks,

Rahul