Update Left Me With Blank Post Editor Page?

I recently started using an old WordPress blog again. Once I updated everything, I had some issues with WP Touch and WP Super Cache conflicting with each other. I disabled a bunch of plugins and kept refreshing the post editor as I did each one. No matter what I tried, the entire post editor page remained completely blank. I installed Lightning Cache and deleted Super Cache. Still the blank editor screen. I also tried changing the theme to a newer version. That didn’t work, either.

The page I need help with: [log in to see the link]