The ads are not showing up in the post

Hey!
I am having some problems with the ad sharing plugins. The
problem is fairly simple to explain. The ads are simply not showing up.. I am using plugrush ad codes and I know other sites who were able to make it work, however for me it is not working. I am using a sub-domain multisite though and the other sites that I saw using it used the other kind of multisite(example: http://cheese.com/usersite).
I have configured the plugin in the network admin and tried my best to make it work. But whatever I do the ads are just not showing.

Any help?