I have a "Can View" link for one of my Dropbox folders that has worked for the past three years. Now, whenever anyone goes to open it, they only get a blank white screen with the Dropbox URL. I can see all the files when I log in to my own Dropbox account. I tested the share link as a viewer and can't see anything. I have not changed the link, the permissions, the files themselves, nothing -- and the link has worked for three years. Is Dropbox doing an update?