No Posts in RSS-Feed

Try deactivating all of your plugins, then check your feed at http://catenaccio.de/?feed=rss2

If that resolves the problem, reactivate each one individually until you find the cause.

Are all plugins currently deactivated? Is there anything in your .htaccess file that could be redirecting the feed?

Ok, I think I may have an idea. Looking at your feed structure, it looks like you’re using Mint’s BirdFeeder pepper, which means that you’re either using a plugin or you’ve modified your feed template. Since you said that all plugins have been deactivated, I’m going to guess that you modified the feed file.

Try to un-do whatever modifications you did to the core files. If you can’t or don’t remember, download WordPress again and re-upload everything except the /wp-content/ directory and the files inside.

Once that has been fixed, I hope, feel free to re-activate your plugins and use either this BirdFeed plugin or this one instead.