I changed the number of posts to be shown from 12 to 3 and now all of my adense ads are back to generic Google ads. I am using Blogger..... Is that the reason for the ad changes....reducing the # of posts shown? I'm thinking maybe now there are less keywords?
How long have you been waiting for them to change? I would say give it a few hours atleast. You should have something original on the frontpage anyways, something that isnt on the other pages, a description of the site or something like that
you can only have one article and still get related ads. sometimes when you make a change, it takes a little bit of time for google to start showing relevant ads again.
I guess it does effect the adserving. It happened to me also and I reduced it to four and the ads were appearing fine.