I saw same icon in image window, but when I click it in my MW 1.27.1 wiki, it only show you are not login.(Where I am login-ed for sure )
Any other extension or config need to be set to get this function work?
Here is the upload that I mentioned: http://i.imgur.com/0HcDtYB.png
Error example: http://i.imgur.com/D3w6am8.png