My profile picture is broken on all SE sites but meta.stackexchange. I first noticed this on my stackoverflow profile. The src attribute of the image is "file://i.stack.imgur.com/JAQzE.jpg%3Fs=128&g=1?s=128&g=1". If I change file:// into http:// my profile picture loads fine.
I've had a problem with my profile picture before. At that time I got an error (Invalid image type) when changing any of my profile settings. So my own post here at meta.SE and this post on meta.stackoverflow could be relevant.
