Hi,
That’s not what I see at all, the plugins installed have all been installed for months with no problems.
What has changed?
This is what I see,
First screenshot is what I get when I click edit with cornerstone from the Dashboard pages list.
Second is what I see when I click on edit from the content list within cornerstone.
The page loads fast enough, but it is not editable. And since when did clicking edit page from the Dashboard pages list open to the content list and not actually open the page from editing!
Nothing has changed on this site for over a month, why is it broken now?
Also what is with the menu appearing behind the page content now, I say again,

nothing has changed on this site so why is it broken now?