Sometimes the sites that the pictures are coming from and the rest of the page are coming from are different. Example is banner adds. If you are running something like Spybot S&D 1.4
, it well maybe blocking some of the add sites to protect you from spyware. If it was me, I would not unblock them. To see if they are blocked go to Tools>Internet Options>Privacy>Sites
and look there. Like I said I would not unblock them.