I tried do some Super Cache options, especially the pre-load feature of posts.
After that my site just showed an empty page.
Thanks to hostgator support, I renamed the plugins directory and the site was back again. Then I restarted moving the plugins back into the real plugins directory.
I started reusing Super Cache for security reasons only my backup site.
As soon as I moved (or even) reinstalled Super Cache plugin, the site showed an empty page again. Then I removed super cache again but normal posts show an 404 error like
If I want to use Super Cache again, I need to know how to reset all Supercache options on the DB. In principle it looked nice before I started the pre-load of posts.