I updated my cilent's website from 5.5.2.1 to 5.6.3.2 and now I cannot edit the Files. When I went to Settings > File Manager Permissions and click on View Files a blank popup shows up (see attached screenshot). I also cannot get the System pages to load in the Sitemap. I noticed that my Recent page history under the Dashboard is only displaying the current page. I think C5 is booting me and logging me back in each time I go to a new page. It's really frustrating. Anyone know how to fix this?