Ad Not Showing Up in Wordpress

I am trying to figure out what the problem is but my ad is not showing up in the sidebar. When I create the ad in adsense and place it in the widget and save I get the not found error for a bit and then it goes blank.

Any ideas? I am trying to determine if it's Adsense or Wordpress. Has this happened to anybody else?

http://www.barelyhangingon.com/

 

You already have 3 ads... 2 468x60 banners on posts and a box at the top side bar... do you expect more?

 

I thought you were only limited to the number of the same sized ads? No?

 

no your only allowed 3 actual adsense blocks on your page

 

A total of 3 for adsense for content (regardless of size) + a search box, and a link ads..

 

3 banner ads, and 3 text ad links

 

plus a search box

 

Perfect and thanks. I put that small ad the top right the other day to replace something else that wasn't working out.

Thanks again.