I had a user complain they couldn't upload a profile picture. I tried to change my current picture as a test by both uploading one from my computer and the web, and got this error. The error when trying to use a url is either "The entered URL doesn't appear to be valid" or no notification at all, it just fails. Urls tested are http://imagizer.imageshack.us/a/img717/9093/oioimini.png and http://i.imgur.com/DSh5Yy2.png Ultimately I was unable to change my profile pic.