Some strange stuff been happening with our DNN deployment lately.  The most serious of which is that our users in the admin role seem to have lost the ability to access the "images folder".  For example, you're adding new content to a text/html module and you go to add an image...  images window opens but no content is displayed, none of the subfolders show up?

Have looked at the permissions in the file manager and admin has view/edit rights.  Anyone have any suggestions as to how to resolve or troubleshoot this?  As far as I know we have made no changes to the site configuration.

Any help would be greatly appreciated.  Thanks