sitemap.xml only in main blog

I added the files to the locations and modified the .htaccess for the plugin, i can see the sitemap.xml for my main blog but not for the rest, however i can see a sitemap.xml file inside ..../blogs.dir/id_blog/files/.

If i go to any blog of my network, like whatever.mysite.com/sitemap.xml i can actually see the sitemap, so it looks like the main sitemap is just not consolidating the other sitemaps

Any ideas ?

cheers,
K.