Really annoying error - Unable to get permission key for view_edit_interface
Seems to be called by advanced permissions being on.
The loss of editing work (ie moved block disappearing) is really detrimental to the users experience
I have just had to rebuild a page for a client.
Have you checked the bug tracker to see if others are experiencing this issue in 5.7? If no one has reported this issue, I recommend reporting it and including the steps required to repeat the error.
concrete5 bug tracker