Out of the blue my edit.php file was giving me a blank white screen. I hadn't installed a new plug in in a long time. I determined that All in one SEO was the culprit. If i deactivate the plug in it solves the issue.
I ended upgrading to the newest versions of AIO SEO and now receive a Internal 500 error when clicking Post or edit.php. I can add a new post but get the 500 if try to manage any post.