Website Management not show correctly (no replies)

Hi,

I have a clean install of Piwik 2.3.0, there the Website Management looks fine, but any Piwik version higher the Website Management (Settings -> Websites) is messed up and all to the left. (see print screen)

I just installed a fresh Piwik 2.6.1. I tested in Chrome and Firefox.

Anyone have an idea?