Hi Jeremy-
I checked out the Cloud WordPress installation you referenced, and it looks like a fatal error involving the plugin gravity-pdf-development was causing the issue. Our System Admin team deactivated that plugin for you.
If you’re actively developing your site, I definitely recommend making regular backups to be safe.
All of that being said, the fatal error with the plugin should not have caused your File Manager to fail as well, so I’ve filed a bug report on that for you, and our developers are working to make sure that doesn’t happen again.