page not found on using a non static start page

Hello everyone I think the effect occurs due to my configuration. At the moment I use on my startpage on http://lisseck.com no slider but the hero content feature for an about me entry. Further I configured the startpage in that manner that the last posts will be listed. This worked until I deleted all old posts and created a new one with real content. Now I get an http 404 instead a list of posts. I don't know why an I don't have an idea about the possible cause. With kind regards Winfried Lisseck