We discovered a large number of images on the site were broken. We used the Postimg.org service which is available for forums and blogs etc. The new url for them is http://postimages.org. The service has been available since 2004 and many forums and blogs depends on them for content.
For some reason the domain was blocked without notice. We have fixed all the links with the new host URL which should bring all the images back to life.
We use Postimg mostly for screenshots of Windows which tend to be numerous. We have many technical articles and screenshots are an integral part.