I haven't been able to save posts for the last week. When I try to add a new post, I can add the title just fine, and I can type the post, but none of the post text saves when I click Save Draft. I also see an empty post when I click Preview. The same thing is happening with Pages, too, and I can't upload images. I haven't added any new plugins. The only change I made was adding a file to the root directory through my host, but I tried deleting that and the problem persisted.
I've tried: -updating themes and plugins
-logging out and logging back in
-clearing browser (Chrome) cache
-using a different browser and going incognito