I added images to the server via CiviMail (KCFinder). But when trying to use the UI to insert an image and click "Browse Server" I receive an "Unknown Error". None of the images are displayed. I'm unable to locate the images and insert them into a new mailing. Already checked the Resource URL and Directories. See image attached.
CiviCRM 4.7.11 and WordPress 4.6.1