I've been having this problem for several months.
1)When i try to create a new post or page and i want to preview the post it just kicks me out to a blank page.
2)The add media function is complete broken. The box to add the media comes up but none of my files are listed.
3) I just tried to activate a plug-in and it kicked me out to a blank page with the following url:
Nothing is loading properly on my back end and i am loosing my mind! Please help. I running the most current version of WP. All plug-ins have been updated. Theme has been updated