I solved the problem – deactivating all plug-ins helped !
Hey Basilis,
Thanks for your quick help!
Now i did the update & somehow i can’t update my pages anymore. The field where normally the layout editor is at is totally blank (see link under “private content”). The post section works normally, but for pages i can’t see and therefore not edit my content. at the homepage itself everythink looks normal.
What could be the reason for that?