Semiologic Pro Adsense problem

Hello all … I’m hoping someone could help me with this.

I am running the new Semiologic Pro V4.
I have configured an adsense ads placement ‘distribution’ to appear inline in each post on my blog.
I have ticked the default boxes for all 4 default locations (Home, Post, Page, Archive)
It works fine, except the ads only show up in the posts if you access them from the Recent Posts menu or other menu (such as Categories) … but they don’t show up in the posts on the main page of my blog.

I’d like them to show up on the main page also, in each post entry.

Could anyone suggest what I need to do to fix this?
I’d really appreciate any advice.

thanks
Wayne