Hello,
downgrading to version 4.7.1 and to 4.7 didn′t help. So I upgraded again to 4.7.2
But it still remains the same. There is no sidebar displayed on those pages I have edited after the update to 4.7.2
Another thing is strange. I tried to look if it′s possible to activate the sidebar with live preview by clicking on the dashboard on
Design -> Customizer -> Widgets -> Sidebar
But when I open a page that I have edited after the update, the sidebar option disappears from the dashboard. But only on those pages I have edited after the update.
What′s going on here? Has anyone a clue?