Broke all my WordPress Posts

I installed the plugin and liked the view of it. Because it could not be loaded per default, i installed it. And now all my posts are broken (title cannot be shown any more, not editable any more). Check the screenshot: https://hans.to/go/Bildschirmfoto%202013-09-26%20um%2019.49.21.png

Is anyone able to fix this or had same issues? Thank you!