I've noticed that when I'm creating a new document and I shut down the computer without saving (laptop) and the RAM is still running so everything's saved when I open the computer again. If I then go ahead and save the new document Umbraco looses track of all nodes and only serves blank pages to the client. The Umbraco Backoffice is accessable though.

This can, for now, be solved trough internal and external indexing under developer tools alternatively publishing the site again and rebuild the internal and external indexer.