new blog templates & domain mapping plugins: The requested URL /news/ was not found on this serv

hello,

I have a probleme with a "sub-domaine/website" created with the new blog templates & domain mapping plugins.

When i'm write the new sub-domain name in adress bar: there is just the index page comming, thats sit. no page, no post no tags however existing in the sample website...

""Not Found
The requested URL /news/ was not found on this server.

***thanks for the help