General Discussion

That Postimages site has a quota for non-paid accounts, so after so many views that blue box is displayed instead of the image you tried to host there for free. There are some other sites that do the same thing too. After so many views of your post, that's what is displayed, though you might still be able to see it if it's cached.

I can see the image above, but if you just re-uploaded it for free on the same site, that might also get blocked after so many views. Best is to use a different image hosting service for high traffic sites and forums like DU, or you could get a premium account with Postimages if you want to pay for it I suppose.