I am having the same sort of problem on two of my sites. I am not sure whether it is the exact same problem, but I try to edit any page and I get a white screen, nothing will load properly in edit mode. It does not seem to be shortcode that is causing the problem.

If you try to access a page from the main dashboard, the theme seems to lock up. I refreshed the browser about 5 times to actually get to the page, then when you edit anything (default editor or in advanced editor) the update icon that spins…. stops spinning and the page locks up. Then if you try to refresh again, the screen goes to white….

I turned off all plugins, changed the theme back to wordpress default theme twenty16, no problem, everything loads exactly as it should.

I tried to set up debug but even that doesn’t seem to work.

This is really frustrating as I can’t update anything. Really need some help fast…