A couple of weeks ago mine went away too. I then uploaded a new headshot. My guess is a recent update to the IDZ website broke some links.
I wonder what else got broken (links to images in blogs and articles).
Before logging in, Andrew's picture was Xed out, Steve was represented by a pawn, Jim's was visible, and my avatar was still running for its life on the mean streets of Boulder. After logging in, Andrew's image is visible. You would thing this bug should have been designed to be a bit more consistent.
Blue pawn? I was reminded of a bottle of Waterman's Inspired Blue Ink, see http://www.waterman.com/en/ink-bottles/189-ink-bottle-inspired-blue-fountain-pen-3034325106793.html .