Iv'e noticed it a few times but can't remember where to look for them all now, but Quicksilvers My new bike CR 125m in biketalk is a classic example, no picture shows in his first post, everyone else seems to be able to see it.
I just had another look and still nothing shows even after waiting a few minutes which I often have to do with this bloody 28.8 dialup
Pokeys option 3 could explain a lot, I'm always on the outside looking in.