Using XP and sometimes the pics are displayed on the sites, other times all I get is a white square with a red X in the top left corner. I have checked the config in Internet Options. All ticked.
Does not do this if I am using the opera 6.00 browser (which I was going to delete).
Could have to do something with privacy settings in your firewall (blocked referrers) or with adblocking applications or disabled active scripting in Internetoptions or problems showing gifs after SP1 or... . Do you have an example URL, on which the problem occurs?