I am using the two column, right-hand SB.

I have tried to add Google Adsense ads into the sidebar using widgets, but they are only appearing on the home page and not on the post pages. The ad in the header is throwing me only PSAs (VERY frustrating, considering the amount of keyword research I'm doing!) and I have put the ads into the sidebar in the hopes that the problem here is the particular ad unit in use.

Is there a setting that I need to change somewhere in order to make these ads appear? They are only showing up on the home page!